Legit question, what makes you guys want to play CS:GO surf over CS:S?
We tried out some of the free public timers a while back, but none of them would work out for a decent skill surf server. They didn't allow you to have stage world records, which is a huge part of why people spend so much time surfing. The zoning system it had was painful to use for staged maps and felt like it was made for simple one-part bhop maps. I also don't think it allowed you to tier maps, which is another thing you need in order to have a successful server.