I'm pretty new at git and only use github. Why should I use this over the official github client? The official app is pretty easy to use and makes sense to me.
And Windows Github client feels really strange, even comparing to Mac's one. Like, I am expected to be, a degree of magnitude dumber or something. Which would be fine, if I did not switch between Windows and Mac every day (Work/home) and got a shock every time...
Git does not equal Github. SourceTree allows you to use most of the features of Git (the program). The official Github client lets you use some of the features of Git (the program) but is mostly an interface for Github (the website).
By their own admission, the Github client does away with the majority of Git features. If you want to find out what you're missing: http://git-scm.com/book
I can't think of any reason why you couldn't use both. I haven't used this windows client yet, but on the mac it has quite a few features that really make it worth your while. I still commit and manage git from the command line mostly, but its worth the price of admission just for the graphs and diffs alone.
