As a player I prefer telling a good story and acting a character over learning rule systems or optimizing stats. I enjoy playing "weak" characters and games where you don't have to be a master of combat to feel successful. These days I tend to gravitate more towards either completely home-brew rules or rule-light games with more storytelling.
I have mostly GM:ed in my day, so it would be nice to get to do some gaming as a player too some time.
I have GM:d Drakar&Demoner (Swedish variation of D&D), GURPS (with a self-made Aliens setting), Unknown Armies, Paranoia and a slew of other systems, mostly homebrew. As for gaming I've played a lot of different systems including Vampire, Mage, D&D, Star Wars, Call of Cthulhu, LARPs and many others.