Well there will always pro and con... IPhone I did not see lags even u install quite some number in it, but some android yes... Especially lower specs one... But if u see the specs of the lower spec android with iphone it is about he same...

What I can say is iPhone OS build for the phone, but Android phone needs to build to meet the Android OS performance...

As some of them says if you prefer to have a frust free entertainment phone, iPhone is good... But u prefer customisation n don mind a bit frust the android...

I'm using wildfire, it lags a lil and needs u to kill tasks n restart sometimes to run smoother... I don see even galaxy s or desire will not need to do that, coz theyare running the same platform... u need to manually kill some task in order for it to run smooter... If u used wm or symbian b4 then android will be much fun or course...

haha it does not last me a day for frequent calls and APN on the go...
I got quite a numbers of apps... about 15 of them now including games... it lags sometimes but after u kill the apps using advance task manager then it is better... yea sometimes lags a bit here and there like symbian, but still bearable... if you want lag free androids please get those top range, not lower range like Wildfire...
i never face really hang up b4 until now, *touch wood*, but wildfire serve me well...