tl;dr i've played both tablet and mouse and to my experience some maps are easier with tablet and some are easier with mouse
Although it might just be in only my personal experience, spaced streams, consistency of movement and repeated jumps with sharp angles are usually easier with tablet, while things such as low ar, snapping, linear patterns, and in general the cleanliness of cursor movement are improvements that I feel when playing with mouse (maybe cause of polling rate but I wont go into why there are advantages). I can't put all of the advantages and disadvantages into words but from this I think everyone should realise that although tablet MIGHT (i stress might for some people - 'preference') be better for some people in certain aspects of the game ---> gaining PP because PP rain comes from jumps, acc, spaced streams, etc. that tablet excels at --- usually they will also suffer in other aspects of the game, which you will then excel at because of your choice of mouse over tablet. That's why mouse players (speaking really generally) will be better at some maps than tablet players assuming they have the same pp or 'skill' level, and of course the vice versa, as just stated would also true. Even to this day when I've switched to tablet I still find certain maps easier with mouse (because I used to be a mouse player), and certain maps I once fc'ed with mouse years ago I don't even think I can do today, despite how much pp I've gained with tablet
on a side note, tablet feels weird for me because reaching different parts of the tablet require different movements while you can just slide a mouse around on the same plane. Anyone else feel like this? O.o
don't take this out of context, i'm just stating my personal experiences with mouse and tablet; hopefully it might help someone reading it.
w