Folley was solid and smart puncher but I think that he lacked durability and chin to beat Haye and his quick right hand. But if Folley is able to get past 6th or 7th I could see him being the winner.
Folley was more flat-footed and he didn't take the best punch, but he would have a relatively easy time landing his counters and I'm not so sure if Haye has the durability to pull through if he gets hurt early. I'd go with the more proven man in Folley, but Haye is certainly not without a chance to win if he lands his best shot.
If Henry Cooper could outhustle Zora and little Doug Jones ko Zora (both one out of two meetings) i think you have to go with David, Zora liked repetition, he looked great against the slow steady aggression of George Chavalo, He was able to Matador the constant predictable advance of George, Haye on the other hand will bring unpredictability, Rattlesnake Strikes, Bullmoose charges, speed and power, in this match i think it would be Folly to bet on Folly ! Dave may be classed as a small'ish Heavy today But he would be physically imposing against Zora. - but with none of the Chavalo Plodding.
Let's not forget though that Zora made short work of Cooper in the rematch, and Haye wouldn't have stood up to the beating Doug Jones suffered in the early rounds.