Andy Ruiz is clearly the better boxer, and he has a good chance of winning by a decision if he executes a game plan that frustrates Wilder and forces him to make rash decisions, like you said.
The problem is, when you have a KO power like Wilder, you don't need to be that skilled in boxing.
I see Ruiz leading the bout with a good game plan until Wilder comes from behind and knocks him out.
As Mike Tyson once said, "every one has a plan until they get punched in the face."
I'm afraid Andy Ruiz would find that statement to be true, especially when his opponent is the only man that has knocked down Tyson Fury a couple of times.