That's easy, anything with bologna deserves MW. Litteraly everything else is mayo
Heh heh, I use MW exclusively except for when I don't. Mustard and MW or mustard only for ham sand, or honey mustard only. BBQ sauce for bloney except tor when i'm making it with the works, thick slice bloney, cheese, onions, and lettuce/tomato, then it's back to mustard and MW. Steak sand gets hot mustard and horsey sauce.
The only thing that ever gets mayo, is a turkey sand.
Kinda eclectic.