The TF300 is actually the same spec wise as the Nexus 7, so it can easily be used as a test bed for this type of stuff, the only one thats really better is the TF700 as it has the fastest quad core tegra 3 chip out there right now. The Nexus 10 only has a dual core processor in it, but it has more memory, 2 gigs instead of 1 on most other tablets.
I'm surprised that Boat isnt tested here, its one of the most downloaded android browsers on the market, I'm not a huge fan of it myself but it should have been in the list.
As for Android and tablets over iOS and tablets, well iOS is the same OS on everything apple makes, Android Jellybean works just fine on everything you can get it on, tablets included, what the issue is is that a lot of the developers arent updating their apps to take advantage of speed and graphics that the tablets use, this has nothing to do with Android itself, the OS runs great on my TF300 but the apps arent up to par yet with a lot of them being stretched to fit the screen as they were designed for phones and of course they arent in HD either, but thats slowly changing with stuff like Angry Birds Star Wars and many more that have an HD version just for tablets now.
iOS developers update their apps much quicker, sometimes having things ready to go on the day a new Ipad comes out (like Infinity Blade when the Ipad 3 hit the shelves) and its a much nicer ecosystem in that regard, but then you get all the hold back on decent apps, other browsers and the list goes on that IMO, make apples app store much worse in spite of the better selection. As an IT professional I can get access to so many more useful apps for my job through an android tablet because Apple simply wont let them on their system, and thats a shame really.