It's really about what works best for you and for the project. We use Subversion for in-house projects primarily because we find it's much easier to explain how it works to non-technical folks. Also, we keep pretty much ALL our project files in there - not just the Adapt src and build - and Subversion is a little better at dealing with very large repositories containing some very large files. Our project repositories are typical several GB in size and can go as large as 20 - 50GB and, in one case, 90GB!

Even though it was written quite a while ago, there's quite a good summary of Git vs SVN here.