Gotta be honest, I love them both.
It's easy to draw comparisons between the two games, but I think as you invest more time into each game you'll find that Crackdown inspires more "sandboxy" gameplay and inFamous is a much more guided experience, with an actual narrative.
Because of that, the games are harder for me to compare. Like I said though, I have mad love for finding green orbs and I'm a sucker for that red electricity 
VERY interested in seeing what the sequels have to offer.
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