I think there is no comparison between online and mobile games. Both have their own plus points. Some people prefer online games, others prefer mobile games. So it depends upon person's choice. For example, if I choose online games, then I have a wide range of games to play. On the other hand, if I choose mobile games, I have to install the games according to my phone's storage. For browser games, one must have a internet connection whereas mobile games can be played anytime anywhere after installation.