So just black suit Peter vs regular Miles? Idk I’d put money on the more powerful of the two but realistically Peter’s experience and enhanced strength from the symbiote would prevail anyways

Well the problem is that Miles Morales met Peter Parker of Earth-616 twice then before secret wars, and at least fought him once, which means Miles Morales fought a much older and experienced Spider-Man, but as you said, this one got the symbiote, and younger if it is in the lore currently.

Parker

The Secret Wars Spidey gained nothing from the symbiote... No additional powers, just had a suit that could change into other clothes.

So yeah go miles

I’d say Peter Parker. No one can outwit him

Miles has stealth and venom blasts, as well as the same enhanced reflexes Peter has... Peter was only 4 years older than Miles is now back then. This isn't a slam dunk for Peter, but I think he does win, a majority of the time.

Black spider-man wins.

Which one?