Frazier? Too me a young 225 David Tua who fought almost like Frazier with a dangerous power left hook. I would have say Holyfield but Holyfield can box and move angles while Frazier is mostly a fighter who looks for the kill. And Holyfield never had a 1 punch power that Frazier brings. Tua however in his young 225 pounds days did.
Marvin Hagler came forward with his left hand high, on the balls of his feet, and with a lot of head movement. He also had a damn good left hook and a true fighter's mentality. An early Mike Tyson had a ton of head movement and a vicous left hook.