It is tempting to gravitate toward definitive conclusions (xxx will flatten xxx), but to be honest I don't see it. I think Chisora will start off stronger, backing Wilder up and landing decent overhand rights, but after a few rounds he will be running on empty. From thereon in, a gunshy and sloppy Wilder will pepper Chisora, who at this point is saving energy languishing on the ropes, with wild powershots that are mostly partially blocked, interspersed with some signs of life from Chisora before he goes back to the ropes. I think the fight will be messy and difficult to score, and will resemble a unskilled, sloppy slugfest between shot fighters, because fundamentally that is what the fight is.
Wilder needs to come out firing from the bell, go full Octopus in round 1 to wipe Chisora clean out or he will be badly stopped himself.