Personally I'd easily and without hesitation pick inFamous. Had a great time with all the games and the smaller downloadable ones. I remember the first having quite stiff animations for cutscenes etc but it felt real good to play.
I didn't mind Prototype 1, from memory it was a bit janky and repetitive, but had some fun to it. The 2nd game I hated, it felt like the game was made by interns or like when a Disney movie got a random sequel, like Aladdin, but it was made by some random studio and the quality almost gave the impression it was a counterfeit.
I remember it having a lot of bugs and screen tearing too. Don't think I played more than a few hours of it either. Plus I kinda forgot Activision used to make games and create new IPs.
Would be really into an inFamous remake, if it came to PC.