I'll give ya my experience.
I too would go to Knotts, and tried Horror Nights last year. We went on a Saturday, mid of the month or so. The walk from the parking lot to Universals was pretty long, no trams from what I experienced, but it was tolerable. Once you get there to the front gates, you can already hear everyone screaming and getting scared. The music already crawls down your spine, but at the same time you're excited to drop in to see how it's like.
Once we went in, there were monsters that did run/walk around. They don't come rushing at you just yet. It's fairly left dark with some lights shown around, lights are purple to other colors. The whole vibe is great UNTIL, we went down the 3 escalators to get to the lower lot. Which had the Chainsaw Massacre, Jurrasic Park, among other things. They DID let Leatherface run around with a chainsaw, some clowns as well.
While we did have a good time down there, it was time to come back up. And going through those escalators, killed the scary vibe again. We then went to the ride where they take you via tram to the back lot. You walk through a huge maze that's too open with little to no monsters roaming around. I felt as if it was a waste of time, but it was okay. We did pretty much everything, every show as well. Chucky's comedy show is very funny once people get involved. He interacts with you and jokes around lol.
This year, I find myself going back to Knott's though. If anything, do message me if you need more info!