Clayton (Green acres and RMR) is actually about 2 hours east of Davis (Crossbar). I haven't been to any of them but based on my experience level I'd be more apt to join a Crossbar trip.
I should have checked, I was thinking it was only another hour for some reason, at 2 hours difference I'd favor crossbar as well they've got a pretty good range of stuff I think. It was Ultra 4 nationals last time i was there so I didn't really get a good look around. liked what I saw tho.