Plain screws for me. I use solid Oak panels, I've been beating on my panels for a few years and haven't had one come apart on me. If it was going to be in a commercial setting, I'm sure I'd do something more substantial, but i haven't come close to tearing one out yet. Party after party, kids, whatever... it's worked fine.
I know some people would swear by more substantial methods, but I've yet to have any problems with it.