I've heard a lot of people who seem to know their stuff say that Mercurial is superior to Git in almost every way, especially when it comes to integrating with

I've heard a lot of people who seem to know their stuff say that Mercurial is superior to Git in almost every way, especially when it comes to integrating with other tooling (i.e. Mercurial seems to have an API whereas automating Git boils down to spawning shell commands). This also seems to be why Facebook switched from Git to Mercurial: they needed to be able to check out individual folders from a branch and Git simply didn't provide any way to do that without first checking out the entire branch. Be that as it may, it's a common misconception that the more popular tool is always the better tool. There are a lot of factors to a tool's success and the technical ones are generally far less important than most people think.