Chisora's style, while seemingly good against Wilder in that he's fighting a messy inside fight, involves taking a lot of punishment to implement his game plan. This is not good against a prime Wilder.
Wilder is all wrong for Chisora and his predictable march forward style,Chisora will try as always but at some point Wilder detonates a huge bomb to end the contest !
Chisora, probably - he'd always start strong and Wilder wasn't durable enough to take the power. If Wilder can find time and space to wind up a full power bomb then he can win, but Chisora doesn't tend to give you that - and Wilder doesn't throw anywhere near as hard without a big opening. Put it all together and I suspect Chisora was durable enough to see out the first half of the bout without being too likely to get hit with the big bomb... And I don't see Wilder being durable enough to still be in there in later rounds when Chisora gets more open and more susceptible to the bomb.
Wilder was proven to be a borderline fraud, although he took a lot of punishment in the second and third Fury fights. A shot to bits Wilder would struggle against Chisora but I could see prime Wilder lasting the distance at least.
Was he?! I don't remember him surviving significant punishment from any proven big punchers... Ortiz nearly stopped him (and would've if not for A-side privilege), and his power was decent rather than earth shattering. Fury did stop him despite not being particularly powerful. It's just another part of the myth - he wasn't made of glass, but he wasn't all that durable either. Chisora certainly had the power to stop him.