I've owned both but kept Potc even though it's my longest tenured game, SM is very nice too I'd give them a tie.
Kept my Potc because it was 99.9 condition I had it since new and never had a problem, my SM was good but like 95% condition.
I felt like I should keep Potc until I get to wizard mode a few times I get very close now so just a matter of time.
However if both were in equal condition I'd say they are equal.
Potc might have worse call outs but I like them fine, voice acting is ok to me.
SM has the worst dots although maybe better with color dmd, IM also had bad dots but is more acceptable with color dmd.
I also own ST and AcDc I wanted Potc more for a unique layout. However I would buy SM in the future if one came up in better condition like new.
Both are great can't go wrong either one.