Servo was always my favorite, too.
Followed by Mike. Sorry, Joel-lovers. Although Joel was great, too.
Remember when screen savers were supposedly cool on your computer? Well, I had a
MST3K:Movie screen saver that would play lines from the movie. I don't remember exactly which lines, except for one that will always remain with me. "Then I ram my ovipositor down your throat and lay my eggs in your chest. But I'm not an alien!"
As for Comedy vs Sci-fi, granted, I only started watching when it was already in the sci-fi era, but I always liked the newer ones best. I didn't really care about the host segments so the fact that they sucked didn't matter. It was always about the movie. And The Touch of Satan ("This is where the fish lives." "This is where my
tongue lives.") and Agent for H.A.R.M. ("Watch me open the hell out of this door.") are tops on the Comedy Ladder of Hilarity.