[Vramin]

I was using Things, but I've switched to Omnifocus. Things seems simpler (because it is), which ultimately makes it harder. Tags alone are not enough, and getting a good weekly review out of the thing is extremely difficult.

I'd guess if you're just downloading a to do list manager for the iPhone (no computer counterpart) I can see how people would probably vote for Things as well (although it has a very clunky input interface), but if you want more than that, Things may not be enough.