Round 1: Pure h2h combat. Diana has no armor, Superman has no flight. Let's take away Superman's cape too for good measure.
Round 2: Both in full costume/armor. Diana gets all her gear, Superman can use all his powers.
Kal is no slouch in h2h. He has bullet speed reflexes. He ended up besting 3 krypotnians. Can match doomsdays strength. Fought the WE weakened, and survived a nuke just to name some of his feats.
So his speed, strength and durability are no question.
He will end up taking hits due to the nature of the fight and how cis/pis has always shown but in the end I see a neck snap or pure KO, or straight up submission.
WW will land hits but they are not kryptonian level / doomsday level strength hits that he already took and didn't do anything to him.
The only real way to stop him is with Kryptonite. As its his only weakness shown up to this point.
Her skin is subject to being damaged, his heat vision can cut her. All he would have to do is get his hands on her long enough to snap her neck, or push his heat vision through her head, or just punch a hole through her.
While WW is very bad ass she lacks the durability and strength that Superman has in spades.
I see the fight lasting for less time then the Ares fight as he was trying to get her to join him.