Yes, but that's video again. When a developer builds an app that takes full advantage of the resolution, there really isn't any Android tablet that can match up. This is especially noticeable when there's text on the screen, which is an integral part of what the OP was going to be using this for.
iPad lacks http://www.youtube.com/watch?v=6FE6XMiuGys. It's just a standard IPS screen stuck at 300 nits. Really, the resolution difference between an HD Android tablet (1920x1200) and the New iPad (2048x1536) works out to be something like less than 10 seconds of arc per pixel smaller.
Perhaps it's just me, but Android - even after ICS - has felt a bit slow. It doesn't feel like a hardware limitation, but the way the OS is written. It simply doesn't feel as responsive as iOS. This is from my experience on an SII and SIII. But, again, it could just be me.
Both the SII and SIII have TouchWiz, and depending on the carrier you used, it's been tweaked further (except the SIII which is universal across carriers). I gutted my SII of all the cruft T-Mobile put on there and it runs like a champ, not to mention you can overclock Android

Maybe "wider market" wasn't the correct term - but my point still stands. Developers tend to focus more on iOS. Maybe the App Store doesn't get the specialty apps - that's what Cydia is for - but it does get solid, high quality apps on most of the spectrum, be it productivity, games, or reading. Lack of focus and moderation on Android insures that it has a shakier app-ecosystem.
This doesn't even make any sense. There's no logic behind your statement of "Developers tend to focus more on iOS" other than your word that they do. I disagree and without proof on your behalf, it's illogical for a developer to do that. And counterexample: Facebook for iOS is just a webapp in actuality (HTML5 webapp, to be precise). Currently so is Android's facebook app, but just this week Facebook announced doing a bona fide Android app, which obviously would require a lot more work than just using an HTML5 webapp.
Basically this one is entirely your word and not backed up at all by reality

Also: Cydia is seriously the worst thing about iOS. Jailbreaking just leaves your mobile device highly vulnerable to all sorts of bad things because in order to jailbreak (and maintain it) you often have to purposefully leave your device unpatched, the exact opposite of Android rooting.
Depends on the content viewed. If all you watch is 16:9 video I can see why it would. If you use it as an e-reader it fits the content better than widescreen. Plus web surfing on a small screen is much less annoying in 4:3 than 16:10 or 16:9. I'd wager most tablet owners spend more time reading and browsing than watching movies.
16:9, I'd agree, but 16:10 I wouldn't. Especially when you can rotate it and rearrange text (Opera, Polaris, most ereader apps).