These days, Mercurial almost exclusively. Thanks to the wonderful hg-git plugin I can even use it to work on git repositories (and I can mirror my Mercurial repositories on github).
Mercurial has pretty much all the features of git, but a command-line interface that seems to have been designed by... well... that seems to have been designed, rather than just emerged from chaos like Greek primordial deities.
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'