Which version control system?

Finished looking over some version control systems today. Have used GForge CDE and GoogleCode before for previous projects plus some testing with others such as Mercurial. Spent a lot of time today with TRAC, a web basd managment tool. It was mentioned at the meeting so thought I'd check it out. Turned out to be a bit of a pain setting up on windows, I miss my mac, but it was fine in the end. After playing with it for a while it seems to be a nice tool. Although I still like google code which we used last year in our software development project, so decided to go with this. Set up the project quickly, will need to go back and do my description properly, but at least thats one thing out of the way...