Something doesn't add up. If you screen tear with a 30fps cap, then you are under 30fps by definition. For the PS3, if there is no tearing for sub-30fps section, then how are they doing it, triple buffering?
Edit the 360 version does not stay at 30fps, you can see in the screen grab at DF the dip into the low 20s.
http://www.eurogamer.net/articles/digitalfoundry-justcause2-demo-analysis
I like how people are dismissing the youtube feature because they don't want to get the PS3 version. It's only the coolest feature in a video game in a long time and perfect for a sand box game with so much mayhem. If you want to get the 360 version, don't pretend to be objectively weighing the features, just get it.
In my case it would be a decision between the better looking and cheaper PC version and the PS3 with youtube, the 360 has nothing to offer for someone with all three.