[ncann]

Also the ability to create custom menu items (e.g for any context menu) for whatever command you desire. It's a game changer for me that I haven't seen in any other git client.

Also it's lightning fast and relatively bug free compared to the mess that is Sourcetree, which used to be my favorite client but then went utterly downhill.

[btschaegg]

I don't know if it's on par with SM, but Git Fork has a system for custom commands which result in custom context menu entries in most cases.

It uses categories like per-commit or per-branch commands.