No brainer...Samsung. Had a iPhone for a few months and cannot understand all the platitudes. The whole itune thing is a pain in the rear, battery sucks, reception is ok, but inferior to the HD2 and Optimus T for signal strength. And the big one: absolutely no tethering or hot spot feature. Using my Optimus T, I frequently use the hotspot to connect my laptop. I'm currently trying to find a G2X at a decent price...friend has one and it's the bomb.
Btw, if an iPhone fanboy, they are/were on sale at dailydeals for $259., brand new and unlocked.