I have been playing tabletop RPGs since I was 15ish (1988). I really enjoy getting into the nuts and bolts of a game and seeing how they work, which I guess is why I love GURPS. Lots of nuts and bolts there.
I tend to run my games with a lot of action, and usually with a twist and I try to make my players think.
I run my games on Saturdays and if I decide to look for a game, it'll be on Fridays, either GURPS, Shadowrun, or Cyberpunk. No D&D or Pathfinder.