damethos parent
I was using SmartGit for many years and was very happy with it, until they made it subscription based and had to switch to SourceTree. It works but I do not find it very smooth at all. It hangs every now (using MacOSX) and in general the experience is not as smooth as it was with SmartGit. I am surprised that you are saying that you haven't come across any better tool.
For a few minutes after reading this I was worried about smartgit losing its way. But it seems they actually still offer perpetual single-payment licenses, where you purchase a few years of updates, usable after update period ends.