I prefer SC and GH 'cause they have more diversity, from twinks to bulked up guys. CF used to great, but there's nothing new about it anymore. The same stereotypes, the same overly photoshopped pictures that only lead to disappointment when you watch the scene and a monotonous photography. Also, I think the layout of CF website is too crowded.
SC has lost creativity along the way and their model updates have been through ups and downs, but the guys are still mostly manly and attractive. The solo scenes remain one of the best.
GH has lots of extremely hot big guys, but not as many good actors. They also have those fake amateur scenes with the models holding cameras and badly recorded videos that don't turn me on.