Well I can say as a long time Android user who has from time to time gone to iOS devices only to return back again (happily) to Android, it comes down to what you will use the tablet for. Media rich content, music, movies, streaming both are just fine. Apps "built for tablet" well iOS does have an advantage there but that is due in large part to Apples strict control on screen resolution and there is only one iPad mfg so they dictate what you get when you get it and they build in planned obsolesence as well.
Now I actually won an iPad through work back in July, and paid to upgrade it to a 64GB LTE (Verizon) model, only to have Apple yank the rug out and intro the iPad 4 just 3 months later. Sure the iPad 3 had been out for 6 months or so, but this is the complaint I hear from Apple fans about Android mfg's too many new devices rolling out. Well the incremental update from Apple is the same thing. The difference is will there be an iPad 5 in the spring as their normally is if so the iPad 4 users will not be happy.
So I am selling my iPad 3 64GB (Verizon) model just trying to decide if I should go eBay, Amazon.com Trade-in or some other route and then cancel my AppleCare+ on it. The updates to Android OS to Jelly Bean and what is coming next with KLP make the move back a firm one for me.
Your mileage will vary depending on what your ultimate needs are and daily uses will be. For me it is movies, games (of course) but more importantly its being mobile with web content, Cisco related apps for my job and email, office document editing and creating. The question I have is more do I get the Nexus 7 or Nexus 10 either in 32GB.