I have to admit I was always abit skepticle with the ps3, until I got it free with a mobile phone deal two weeks ago :)
Granted I only own Killzone 2 and Uncharted 2, ive had a blast with it so far. Plus I love the blue ray watchin on my LCD :) :) :).
With both ps3 and 360 fanboys.... I think all you have to go is give them a 360 and ps3 console respectively for free of course, and they'll easily learn to appreciate what both consoles have to offer :).
PEACE