I find WOL much better to play on. It's not that the servers are any better either. It's the fact that that because you have to have an unclaimed serial the players have actually payed for the game are more serious about getting good at it and playing a team game.

On GSA you don't have to have a good serial number to connect to a game, therefore all the pirate jerks play there. In my experience there is a much higher chance that there will be tank stealers, non teamplayers, and other forms of idiots on non WOL games.

WOL also has stats tracking and the possibility of WW doing some quality of service control over the servers. (each dedicated server on WOL is registered with WW under a unique server serial number.) If you play well enough you can win prizes on WOL too.

WOL is far better to get a good game of Renegade.