they're both fun imo, but different. with infamous i played through both with good karma & evil karma and enjoyed the hell out of it. that being said, i don't know that i'd play it again.
with prototype i'm not through playing it through once yet, but i know i'll be playing it again with the "+new game" option at least. also with prototype i feel like the character you play is a lot more superpowerish i guess. plus prototype is violent as fuck and you're actually encouraged to kill anyone and everyone you come across - more than you are in infamous
i'm at the greene fight in prototype, and no fucking joke i was 1-2 shots away from killing that uppity bitch last night, WHEN THE MOTHERFUCKING POWER WENT OUT for the rest of the fucking night. anyone who's done this fight knows how aggravating this would be lol
You cant help but laugh when your walking down the street at night for who knows what reason and the power goes out and you hear from one side of the street "NOOOOOOOOOOOOOOOO!!" and on the other side you here the most obscene swearing you ever heard.