Lyle. Peter was absolute garbage, and created as a contender because there wasn't anyone else in the worst era of heavyweight boxing ever.
Lyle is just the better boxer but he will struggle with Peter's power and strength. Lyle decision is the best bet
Pre Wlad Peter was considered the most dangerous heavyweight on the planet and was being avoided at all costs. Wlad ruined him. He would almost certainly KO this Lyle fellow.