Drag and Drop. Everything (well, many things) seems to be as simple as Drag and Drop. Move files between branches? Drag and Drop. Move tags? Drag and Drop. Rebase? Drag and Drop!
It also has a great compare and merge tools built in.
For the Pro and Enterprise version it also has GitHub, GitLab and BitBucket support.
And it's written on the Electron platform, which means it's cross platform!
Lately, on Linux at least, the software started making problems, like endless loading when trying to push or pull. So give it a shot, maybe it's fixed already, but for now it lowers the score.
The pricing. While its free for startups in their first year and for personal use, for every other company it has a monthly fee. In some versions it's a licence per seat.
Now don't get me wrong - the fee isn't that high considering the ease of use it brings, but still, I think it's only a matter of time until other tools will clone the great ideas GitKraken introduced to the world.
If you can allow yourselves to spend the money (a yearly fee), do it. You won't regret (And if for some reason you do - it has a yearly fee subscription pricing model and you can always start with the free trial version so you can cancel at any time).