well, the iphone, despite apple's best efforts, is NOT a gaming platform. it's a phone that does more stuff than it reasonably should.
i wanted a DS for my 17th birthday, but received from my mom (best mom ever, but she doesn't listen) the red "god of war" PSP (god of war FTW!! maybe my mom was paying attention). so, i use that on the go, and i find that i'm actually happier with it than i usually am with sony's stuff. i'm one of those die-hard nintendo users, so being happy with something else is a first for me. but i do like the controls, and the screen gets pretty good resolution, so i'm satisfied.