Simply learn both SVN and Git. I'd highly recommend learning SVN first, due to Git's steep learning curve. SVN will give you a decent understanding of VCSs in general quickly, after which you can hop into more advanced topics. I personally first hated Git when I tried to learn (and am still learning...) it after SVN, but once I got some sort of hold of it, I realized there's no going back (to SVN). As your focus is in making games, you probably end up using SVN more, assuming you will work with not-so-tech-savvy people (artists etc.). If you can, use TortoiseSVN and TortoiseGit - they'll make your life a lot easier.