mouse and tablet have little difference in general terms of playing. but a mouse and tablet have a different style of grip, different arm move schematics and other things that make it important that you choose the best for how you feel.
but to be honest $30 for a tablet is fine considering what money people already spend for a mouse
i made the wrong assumption in thinking that i would find a good number of osu! players on mpgh, but im still satisfied to see a few people here and there.