Overall, I recommended both, but Knott's has the edge.
At Universal Horror Nights, you get a high level of quality and detail in their mazes, and their scareactors are high energy and in your face.
Knotts could learn a few things from Universal or even Tampa's Howl o Scream Event.
Knott's has monsters who can create their character and has very creative scares in and outside of the mazes. The Hanging blows Bill and Ted's out of the water.
My vote is for Knott's.