Can you stage and commit hunks in TortoiseGit? I never knew of this wonderful feature of Git until using SourceTree. SourceTree opened up the power of Git for me, in particular the stage, and more control over commits.
TortoiseGit completely abstracts away the concept of index. Great for those moving from TortoiseSVN. Horrible for git users.
As a TortoiseSVN user, I still think TortoiseGit is horrible period...