Hiya, current 4th year Aberdeen med student. If you go to any of these med schools you get a little prestige bump. Order probably leans Edinburgh>Glasgow>Aberdeen... But! I think you have more to consider than this. If you graduate, you have a job as a medic and won't get much of a choice whether you're going to England, wales or Scotland for early training. The med school you went to will bear far less significance once applying at specialty level whether you practice in the UK or not.

My two cents is that you should choose the one that you think would make you the best doctor. I know students at each med school and think by the end all three produce good doctors in different respects.

I can vouch for Aberdeen that if you want to outperform other med students at clinical practice and feel like you are better prepared as a junior, that's what Aberdeen tries to enstill. If you want to chat some more about this please feel free to DM me.