Ease-of-use when performing operations like branching, merging, rebasing, reverting file changes, stripping commits, access control to files and branches based on user names and groups. Besides that, it's very well written (in Python), modular, and easy to extend / modify.

Works great once you find good software, I would say you should use sourcetree

the branching model is better than Git's, cross branch merges and cherrypicks/grafts seem to be handled better aswell