I have several friends with the iphone. They all complain about how locked down the phones are.. no tethering, etc. Im sure there are modifications to basically do whatever you want on the Iphone, but its nice that Droid is open source.
I rooted my phone and now it can tether metropcs' super advanced network lol. I also deleted 15 crapware applications that came on the phone from the carrier. Very satisfying to delete crapware.