Ugh. Ive been both using ClearCase and also were Admin of it. While as user it was pretty fine to use, as Admin I saw how complicated and fragile the whole thing was. They distributed model is absolutly terrible. You need powerfull box as a VOB server and probably be equal or even more powerfull box if you want to use dynamic views. We ended up using snapshot views.

I would choose GIT every single time over ClearCase.