Haye, and it's not close imo. Povetkin looks more schooled and puts combinations together in a more polished manner, but hit harder? No way.
Povetkin hits harder than Haye. He has fought much bigger and better fighters. Haye ran from Valoeuv and lost, but was given gift by the WBA. Chagaev had won the WBA title from Valoeuv. WBA took title away and gave it to Valoeuv so they could rob Valouev and give it to Haye on paper, that is. That was a set up fight. Haye did nothing but run like Hell. Chagaev actually beat Haye. Holyfield did much better against Valoeuv than Haye also. Haye will never fight a Klitschko, no Povetkin.