I'm not trying to convince anyone that MP is better camera than M6. It's just my take to arseniii's list:
IMHO, it's a trade off between rewind speed and durability & speedy draw from bag/pocket. I prefer M3 style for this. For the ways Leica Ms are often used, I don't think there is definitive answer one is better than the other. It's matter of what your needed "performance" is.
I don't think this is performance matter. If you don't like brassing, BP MP is definitely not the right camera for you. But again, I just like traditional metal materials for my stuff. I prefer steel frame bikes over carbon/aluminum ones. I can take ding or dent, but I don't like cracks.
If you need TTL, then yeah, MP or any other older Ms aren't for you, period. This is also depending on what you like, how you use your camera, not "performance" issue. I disliked taller profile of newer Ms because I don't use flash on Ms so the extra 2mm was just a drawback for me, personally.
If you rely on built-in lightmeter for each shot (adjust dial while you aim, like "manual AE") and/or use other newer Ms (M7, digital Ms), this is definitely a big plus. But if you use older Ms and/or frame&shoot type (set dial before you aim), older dial works more than fine. Say, if I had an M2 and in the market for a newer metered M, I'd go for MP or M6 classic because of this.
So again, I'm not trying to fight or saying MP is superior than M6TTL, and when I first asked the question, I was thinking of your wetzlar M6 Classic (am I mistaken?). Comparing MP with M6 TTL, it's really matter of preferences and priorities (and I know you said "personally" arseniii 😉 ).