IIRC, Apple has better apps in general, especially "Tablet apps"

For those deciding on ipad mini and those complaining of its low resolution....the ipad mini 2 most probably with retina display should be coming out end of the year maybe November.

Watch out for next week's WWDC announcement by Apple.

don't know about tablet optimized apps but i'd still go for N7 because
1. Screen resolution. This'll make a difference between a relaxed eye and sore eye while reading, browsing the web and watch movie.

2. Being a previous android user. I've bought apps from play store, and I'm not gonna buy the same app for the 2nd time.

3. gaming. 7" is just right for me. playing dead trigger where the finger need to be able to travel across the screen, and tilting the device while playing real racing 3.

but, if you're gonna play with AR or take photo with your tablet, take the ipad mini then.

no lag
even if it's lag a bit, it's the game's fault (advertisements)
since u own one x, if the game lags on your phone then probably it will too on N7, since both of them are running on Tegra 3...

one x got NFC or not?
like my phone got NFC, after i take picture i use android beam into my N7 to look at the pic, editing, and do posting, so, no back camera is no issue for me

speaking of accessories, if you're planning to buy lots of them, stay away from N7, coz they're hard to find.

yes, not many tablet optimised app
N7 even use phone interface

since we have up to 6", heck 7" phone also exist (phonepad? padphone? whatever)
7" w/o tablet optimised app is not an issue, since there's barely any waste of empty spaces with phone interface
10" and above w/o tablet optimised app, now that's an issue