At its launch back in 2010, the iPad was regarded as something of an oddity – sitting somewhere between mobile device and personal computer. But Apple went on to create and then dominate the tablet market, which initially grew rapidly but gradually, in recent years, has begun to recede.

As Apple hopes to turn its flagging tablet sales around, the company is offering consumers three choices going into 2016. The small iPad Mini 4 serves as the entry level device, alongside the medium range iPad Air 3 and recently introduced range topping iPad Pro. New devices are rumoured to launch later this year, but how does the current line-up look, and if you have your heart set on an Apple tablet, which one should you buy?

iPad Pro

The iPad Pro was launched to some fanfare last month, offering a range of improvements over previous iPads including higher specs and swifter performance. The new A9X chip has twice the memory bandwidth of the iPad Air 2 and significantly greater storage as well. Apple claims that the new processor means the iPad Pro is more powerful than 80 per cent of portable PCs sold last year. That claim is key to understanding the iPad Pro's target audience – consumers who want the productivity of a laptop but in tablet form. The screen is 12.9 inches and is optimised for Apple's latest addition, the Apple Pencil, a £79 stylus which allows users to draw onto the screen with accuracy. 

The high-end specs and larger size – it is 80 percent bigger than the previous model both in terms of screen size and weight – come at a price. The cheapest iPad Pro is £679, considerably more than the starting price of an iPad Air 2.

However according to Digital Trends, the premium price could be worth it: "Aside from portability, there is really no category the iPad Pro doesn't excel at. It is certainly costly, but anyone who can afford it will likely find it to be the best tablet on the market."

Following its release reviewers have expressed a range of views on the iPad Pro, not all of them positive.

Forbes' Patrick Moorhead focusses on the design of the iPad Pro.

"The iPad Pro feels like what you would expect with an iPhone or iPad with its brushed aluminum body, beveled edges, edge to edge glass and a physical home button with Touch ID. It's as thin as an iPhone at 6.5mm and feels lighter than you would expect for a device with a 12.9-inch display. The iPad Pro weighs nearly the same as the original iPad at 1.57 pounds, which means that you can use it easily with two hands, but it could be a challenge with one hand for extended periods of time."

Moorhead praises the tablet's four speakers which, which compare to just one in both of the smaller iPad models. "My audio experience was really good," he says "with a much deeper bass response than I've ever experienced on an Apple iOS product. I really appreciated the new speaker system while playing games and movies."

One of the greatest disappointments for many reviewers though is the iPad Pro's keyboard.

"I was disappointed with Apple's optional keyboard case, says tech reviewer Walt Mossberg on The Verge. "It's essentially a shallow Mac keyboard, with keys like Command that mean something only in Mac OS X, but not a single shortcut key to an iPad function, like Home or Search. It's also not backlit, and it has only one angle in which it holds the screen. Additionally, it's so light and small compared to the screen that I find it difficult to balance properly on my lap for typing."

It is also very expensive, he notes, at It's also really costly, at £139 in the UK, making it an expensive addition on top of its already high price compared with the iPad Air 2 and iPad Mini 4.

Those considering getting an iPad Pro as a replacement for a laptop may be turned off by the issues with the keyboard and the device's sheer scale. According to Kurt Marko writing for Forbes "Unlike the original iPhone or Apple Watch, the iPad Pro isn't a revolutionary device, however with a few evolutionary tweaks, it has the potential to push more people into an utterly post-PC existence."

Jeremy White writing for the Daily Telegraph is less sceptical that the Pro suffers from an identity crisis saying that it can be "whatever you want it to be. Transform it into a writing tool, a technical design platform, an artist's sketchbook, professional video editing suite – all at the touch of a button or swipe of that Pencil." Those looking for a regular tablet may feel the Pro is too much, but it remains the biggest and most powerful offering from Apple you can slip into your satchel… as long as your satchel is not tiny. 

The size of the iPad Pro means its only real competition comes from outside the Apple line-up. Microsoft's Surface Pro 4 is another large tablet and is the iPad Pro's key rival. The Surface Pro has a slightly smaller screen than the biggest iPad at 12.3 inches. This doesn't sound like a huge difference, but in a head to head, Pocket Lint feel that "side by side, the iPad Pro really does look quite a lot larger." The Surface Pro is thicker too, but its 8.4mm width means it comes equipped with a full USB 3.0 port. Overall, its dimensions and hardware mean it weighs 766g, 53g more than the larger-screened Apple product.

iPad Air 2

The iPad Air 2 was, until very recently, the newest and brightest of the iPad contingent. Even a year on from its release, the iPad Air 2 is a very impressive piece of kit, beating this year's Samsung tablet offering, the Galaxy Tab S2, in a recent performance comparison by Tablet PC Review.

The iPad Air 2 is also much more portable than the iPad Pro. On its release it was described as "ludicrously thin" by TrustedReviews and critics praised its ergonomic design and "lightweight feel".

Despite receiving a 5/5 review from Stuff, the publication's reviewers still found the removal of the mute switch from the side of the iPad a little annoying, and criticised the Air 2's camera, saying "the iPad Air 2 doesn't have the megapixels, aperture or flash of almost any recent decent smartphone."

In its review of the tablet, Alphr said that the iPad Air 2 is "quite simply the best tablet money can buy," and Apple's mid-range product sees off the Android based tablets it competes against with relative ease, and is still the market leader. The site's reviewers praised the design of the tablet, as well as its display. Most importantly, the improvements in performance over the original iPad Air were of particular interest. The leap from 1GB RAM to 2GB, the A8X processor which is 40 per cent faster than the A7 used in the last model, and a new quad-core GPU means that by their assessment, the iPad Air 2 is 52 per cent faster than the original model.

"In short, this is a hugely accomplished and fast tablet," they conclude.

With a starting price of £399 the Air 2 also offers much greater value for money for those not looking to replace their laptop or home computer but who still want significant power and functionality from a tablet.

The Air 2 might not be around much longer though. Rumours on the internet suggest that the Apple iPad Air 3 could be on the way in March 2016, and according to Macworld, the next Air could be even thinner and be offered in a range of colours, akin to the iPhone. It is possible the camera will not improve, but the screen resolution should, possibly approaching the pixel density seen on the iPhone 6S Plus.

iPad Mini 4

The new iPad Mini 4 is "better in nearly every way" than its predecessor, the Mini 3, says The Verge. "It has the best-looking screen Apple's ever put on a small iPad, which alone is worth the step up from iPad mini 2 or 3." According to the International Business Times, it's the "best small tablet yet."

The iPad Mini 4 offers the same functionality and performance as the iPad Air 2 and repackages it in a smaller form. A much smaller form. The iPad Mini 4 weighs just 298.8g, compared to the 496g iPad Air 2 and the mammoth 713g iPad Pro.

However, the iPad Mini 4 is not actually the smallest iPad Apple has ever produced. It measures 203.2 x 134.8 x 6.1mm so it is actually slightly bigger than the iPad Mini 2, but it is also slimmer and less heavy at just 298.8g.

The iPad Mini 4 offers a fully laminated display which, coupled with its anti-reflective coating, makes it much easier to use when it is sunny.

As Pocket-Lint notes, Touch ID is included on the iPad Mini 4, making it Apple Pay compatible. For anyone hoping to use their tablet as a mobile wallet, the Mini's size means that you can more easily slip it into a handbag or coat pocket – the iPad Pro and iPad Air 2 are more likely to require a larger bag to carry around.

Like its larger siblings, the camera on the iPad Mini 4 features both burst mode and slo-mo video. And again, given that it is much more portable than the other two iPads, these features are more likely to be useful for taking pictures or videos in public. But for making video calls all three tablets have the same front-facing 1.2Mp cameras – so none will edge out the other in terms of their FaceTime abilities alone.

The main difference between the iPad Mini 4 and the iPad Air 2 comes in the detail of the screen resolution. As iDigitalTimes explains: "both iPads have the same screen resolution, but because the iPad Air 2's display is bigger, the iPad Mini 4's screen is more detailed."

The iPad Mini 4 is, however, the cheapest of Apple's tablets, starting at £319 - so if price is your main concern, this is probably the iPad for you.

New iPads in 2016

The strongest 2016 rumour so far indicates that the iPad Air 3 could be launching in spring. Typically, the device is rumoured to be thinner than its predecessor, and could be offered in a range of colours.

According to Alphr, the iPad Air 3 could come with a new processor, an 8-megapixel camera, fingerprint sensor, and possibly even a 4K resolution display. The site says that the device could be as slim as 5mm.

However, Alphr also highlights possible pitfalls in the upcoming device. It's entirely feasible that the small size means the battery performance of the next iPad Air won't improve, and could possibly even decline. It also points to strong rumours suggesting that the Air 3 isn't going to come with a 3D touch display like the one introduced on the iPhone 6S. Such displays are gaining traction with consumers, but it seems an iPad with 3D touch is still some time off owing to the difficulties the technology is proving for Apple's supply chain.

Initial rumours suggested that the iPad Air 3 would be revealed in September 2015, but certain factors point towards a difficult birth for the tablet. Apple's current range could be bloated, and the company needs to give new devices like the iPad Pro market space. In June 2015, Apple's iPad sales hit a four year low, and they cannot afford a clash between products within their own stable.

Macworld, meanwhile, brings into question the rumours suggesting that a spring release around March is on the cards, instead highlighting a source suggesting an October release date. They claim that the Chinese website that initially leaked a March 2016 release has now gone back on itself, and now suggests a much broader release window.

If the iPad Air 3 does go on sale this year, a pricetag of around £399 is likely. 

Conclusion

The choice of which iPad to choose is really down to how much money you're willing to spend and how portable you want your tablet to be. There is a reason why the latest device has Pro in its title, reviewers say. The large-format iPad Pro, while undoubtedly the most powerful of the three devices, is more expensive or may be too big for many users, in which case the iPad Air 2 or the iPad Mini 4 would be appropriate. Still, as Digital Trends concludes, one tablet clearly comes out on top: "The Pro is certainly costly, but anyone who can afford it will likely find it to be the best tablet on the market."