If you have the ability to do both, you should do both, do not hesitate, the more, the more you earn, logical, right? A music video can make good money, if you are able to promote your music video, get many views, and not least, you must of course have become a youtube partner. Problem is that you can not become a youtube partner if you only upload music videos (which you most probably do not own the rights to). You must always create a good reputation, good marketing and everything else that goes with. It is about the same in every environment, use time, exploration, and the results will come.