I've used Manjaro on two legacy laptops and a fairly recent desktop and I can only vote for it for almost anything you would want to do with your machine. It's a very lightweight and well-supported distro that has outperformed machines that are on paper twice the speed of the one it's installed on.

Not sure how easy it is to actually game on it though, haven't tried yet. For everything else however, Manjaro is an extremely solid choice, with a very recent kernel too.