To be honest, iPhone is probably your best pick. As long as you don't treat it like crap, it is the most simple choice that you can find plenty to do on. Android is far to disorganized, and their market is a bunch of crap dotted with slightly good App Store remakes.
If you were to get and iPhone, but wanted something not Apple but mobile, I'd suggest a Microsoft tablet or an Android tablet.
I've had my iPhone 4S for roughly 2 months now, got a nice, cheap plastic/aluminum case that protects the back and I simply am a careful person, it still runs fine, I enjoy every minute using it, and I do not miss my Android Eris the least bit.
Edit: I am eyeing that Nexus however. It seems more refined than all previous Android phones, and has more Google integrated into it. But, as I said, no regrets with my purchase and I look forward to what will come in the future.