I'd say 360 Fanboys, because of their style of fanboyism.
PS3 fans seem more "internal" in that they pump up and hype every exclusive game that comes their way. If/when that Exclusive matches the hype, then things kick into overdrive. They seem to get their biggest jollies when "x" game gets well reviewed/previewed.
360 Fanboys seem to bash the opposing console more then PS3ers do and are more "external" in their fanboyism. It seems that 360 fanboys take pride in two things the most....1. When a PS3 exclusive "falls short" of hype 2. When the 360 gets a Franchise previously for the PS family only. (which becomes even funnier when it is a game/series they used to bash when it was PS only)
However, these attitudes are a creature of where each console sits in the race.
