I think commercial games are still extremely popular now and I have actually never heard of open source video games. It truly depends on the gamer though. I know nothing about open source or modifying my own games, so that is why I chose commercial games. They are so much easier and well, I would have no idea where to start with open source video games.
As for which one is better, it is the person’s perspective and opinion, but as I mentioned, I think it would be commercial games, although I believe both are kind of the same.