More ppi isn't everything. Display analysis confirms the iPads are MUCH more accurate than the Nexus 10. Better contrast. Larger gamut coverage....and as far as specs are concerned, if you're really interested....last year's iPad was extensively tested against other tablets (& phones) by Anand and his team. A link to those results
http://www.anandtech.com/show/6472/ipad-4-late-2012-review/4
Notice the improvements in almost every benchmark....the Nex 10 is bested by the iPad mini in several pertinent benchmarks. But in comparison to the A6&6x it gets absolutely smoked. Double, triple....in some cases quadruple the performance of the Nex 10. Again, follow the link. Then, take into account the A7's doubling in performance, yet again. Without the need of the 'x' factor (extra GPU silicon). Here's a link to the 5s/A7 review and benchmarks...again, with other nexus devices to compare to (phones and tablets)
Here, the CPU tests...notice the massive increase in the Google Kraken and Octane tests over last year's A6x
http://www.anandtech.com/show/7335/the-iphone-5s-review/5
And the GPU power (you may need to open a couple tabs up with the first link to compare...as it seems the Nex10 wasn't tested....these are phone specific, but the benches are the same so you can compare them both)
http://www.anandtech.com/show/7335/the-iphone-5s-review/7
And a direct quote about the forthcoming Adreno 330 for the Nex5 on the way
"There are obvious thermal differences between the two platforms, but if we look at the G2's performance (another S800/A330 part) we get a better indication of an apples to apples comparison. Looking at the leaked Nexus 5 (also S800/A330) T-Rex HD scores confirms what we're seeing above. In a phone, it looks like the G6430 is a bit quicker than Qualcomm's Adreno 330."
The A7 is a wicked chip. The Nex 10 was a true pile of doo! Hope is they'll improve it significantly this year and the Android development community will begin supporting and releasing tablet optimized apps for devices like the Nex10. I'm a fan of both Android and iOS. But this A7 is a game changing SoC. It's a powerhouse. There is absolutely NO comparison to ANY other tablets or phones on the market. Period.
As far a GG is concerned, Apple does use Corning's latest glass products. I'd bet dollars to donuts they in fact are instrumental in the development and help with R&D of their glass...and incorporate the latest Corning has to offer. You have to read between the lines on Corning's site. Many OEMs prefer to keep their pieces n parts 'hush-hush'
Sorry to disappoint. But if you're actually looking to buy a tablet...stay as far away as you can for the first gen Nex 10 (I still own the original Xoom!)
J