i think you should just go with tablet because tablet , its more precise that way and mouse can't do much Unless you are really good with it , idk some pros around ....*_*
I use my tablet for pretty much everything -- it's one of the best purchases I decided to make for sure.
Tablet for sure! I'm not too good with drawing with it, so I usually draw things in pencil, scan it, then trace my artwork and add color from there. But if I'm doing small pixel art, then a mouse. :b