seems to me both systems have a method of choosing what to commit, in git you can choose to stash or stage, in the others you can only stash since they "don't have a staging area". git++ for having both options.

Use case: A commit should only do one thing at a time, but sometimes I'm not as organized. I like to do a whole mess of work and when I'm ready to commit it, I use git add --patch to separate out unrelated bits of work into separate commits--even if separate bits of work end up in the same file. It's amazing how much a load off your mind this is--you don't have to be quite as OCD while you're coding if you're a little fastidious about your commits later on.