X2. I go with UD because Usyk fights to the level of competition, or plays possum, or however you want to say it. But if he feels he has to, a stoppage is not out of the question.
I think Usyk should take this pretty easy. He's got the techniques and movement to make it a demolition derby. Chisora is a war horse, but too slow to make much of a difference. I think he just has a puncher's chance in this fight.