Hey Rick. I've belonged to both CF and Chaosmen so here's my opinion.
guys: The CF guys tend to all look alike. They are all generally hot, look like frat guys, and are preppy. Of course, this appeals to me b/c I'm also preppy and have always dated frat guys...at least back in my college days.
action: The action on CF is almost always the same. The guys kiss, lick each other's muscles and feet (Corbin must have a foot fetish), suck each other, then fuck. The scenes really don't vary that much at all. Also, Corbin's newest videos also haven't featured a lot of after scenes action. The action also seems more forced rather than enjoyed and spontaneous.
guys: The guys really vary on this site. Some of them are country boys, some are army guys, some are preppy, some are older, some are pretty, etc. There are several that have way to many tatoos.
action: This also varies. There are "serviced" videos (passive guy getting worked over), "edge" videos (fantasy based...hard to explain), solo vids (some contain toys), oral only (both guys suck), and of course screwing videos (couldn't think of proper terminology--sorry). Some of these include bareback action. The owner/producer, Bryan, is in some of the vids and he's actually pretty hot. There are of course, tag team videos also. A lot of the scenes include out take/behind the scenes action which I always enjoy. I don't think these videos contain as much kissing as the videos on CF but I could be wrong.
I prefer Chaosmen to CF b/c the action seems more genuine and everyone appears to be having a good time. The videos just look better. I've often felt like the guys on CF looked like they were getting rapped.
Of course, others may disagree with me. Oh, and I'm a woman which may explain my reasoning and what I think is hot may not appeal to you.