Mercurial seemed to be a good trade off between flexibility and complexity. I discovered hg (mercurial chemical symbol) at the same time as git, although I was becoming to feel comfortable with git, I recognized that its learning curve was a bit too expensive for any users. The other important thing is that there are many conversions tools from or to git , so if you decide to use hg today you wont be stuck for in it forever, you can convert repo to git and virtually to any other, ever downgrade to subversion using those tools.

Unlike similar tools (Git), Mercurial is incredibly easy to use and polished. It gives you the benefit of running a _distributed_ version control system without the hassle of needing to be a command line expert. On Mac, both I and the team used the command line frequently, but we learned on Windows with an amazing GUI client (Tortoise).

It is easy. If you used to SVN, most of it is the same but more powerfull. If you used GIT, it is the same, but easier to use.