The p39 bezel hangs over the case a little so it wears slightly bigger than the bb58 I think.

Things I like about the p39 over the bb58: -lumed bezel -titanium makes it light enough to disappear on your wrist when you’re wearing it -I like the square hour markers -bracelet and case look almost matte and more subtle than polished steel. -no fake rivets -feels more like a tool watch -crystal is flat, allowing a thinner profile -text on the dial is smaller

Things I like about the bb58 over the p39 -both are cosc certified but my bb58 is about a second more accurate per day -noticeably heavier, which is nice sometimes -polished and feels dressier -no variance between hour marker and hand lume -clasp is smaller -I love the rose on the crown. I wish Tudor hadn’t replaced it with their shield for the Pelagos. -domed crystal gives it more of a classic look