I have never been to the LA or SF shows but the OC show (at least last time I went in 2001) has a pretty large floor and there was plenty of boats and booths.
I don't think it's as large. I was there last year and plan on going this year. It was pretty good size, but either way, all the players we would be interested in are there. I will probably go the 2nd or the 4th.