I'm going to purchase a new board i have 32 prions in a size ten and
A half. Im sure I can get away with a regular size board and not have to go mid wide right? Any suggestions or comments about bumping up to mid wide. I rather stay on a reg size board
Suggest you check the specific waist width of the boards you are looking at. Wide and mid-wide do not mean the same thing for every manufacturer and board model. You did not tell us what board length you ride, but with 10.5 size boots (not sure whether the Prions are particularly bulky or slimline) you might just get to the upper limits of some of the more slender boots. Obviously your stance angles also matter.
In short, figure out the waist width you need and then screen the boards you are interested in based on that.
I have the same question. If I am riding board with 252 mm (Burton Fix 155) width now without problems, will I have problems with 249 mm (Signal Park Flat 152)? My stance is +12/-12, 22 inch wide and boot size US 10,5.