Personally, I prefer either Mercurial (hg) or Bazaar (bzr). However, since GitHub is the place to do open-source development, if you're going to play in that arena, you've got to be at least familiar.
(There's probably an interesting thought there, something about superior tooling around acceptable-quality software being a killer combo, but my employer would probably rather me philosophize when I'm not on their dime.)
It's the GitHub pull request. That's the killer feature of Git, even though it's not a feature of Git itself.
And Mercurial (Bitbucket, Kallithea) has it as well.
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