I really didn't have antenna issues, actually my 4S was much better than my 4.
But I totally agree with everything else you said. Customization is huge, and having played around with Android for a while now. I like being able to change my keyboard, awesome notification shade, create or download awesome custom alerts, huge screen, NFC (although I don't use it) complete bluetooth functionality, and overall theme the phone to my liking without tickering.
But I know Apple isn't going to do have the things I listed. But even a few simple things like the keyboard, and the ability to change the grind up a bit would be a plus!
GS3