Most of the functionality is there on all three phones. It's coming down to a matter of personal preference, based on what you seem to be most interested in. Although if features like iMessage & the Apple ecosystem could play a role in staying connecting with your current hardware or stable of friend's devices, perhaps that would tip the scales a little bit. YMMV.
I'm looking to update my first generation droid for verizon. I have been holding off buying a new phone for these new LTE phones and the iphone 5 (which never came!). I was wondering what everyone thought about these three models? I use the phone primarily for calls and texts, GPS, music, some web surfing, and checking gmail. I have used this droid and also an ipod touch. I like them both so this decision is pretty hard. I like droid's texting software, large screens, and LTE. However, I like the iphone's siri, compatibility with docks and other accessories (since all of my friends have iphones also), and the easy of itunes syncing. Let me know what you think! (also if you know anything about the new HTC rezound, feel free to post about it)