On the third hand: while pushing a line of commits to Gerrit does create separate reviews for each, there's nothing stopping you from pulling the entire branch down and looking at it as a whole, as well as being able to make sure each individual commit makes some level of sense. I especially like how Gerrit+Jenkins lets you build every revision. I don't like the way that GitHub and similar tools (thinking specifically of Stash) make it more difficult to look at the individual commits.

I'm also a fan of Gerrit having to option to enforce fast-forwards, something GitHub doesn't allow: it will always make a merge commit, even if there's only one commit and its parent is HEAD of the branch being merged to.