Most Helpful Guy
I've only played Morrowind and Oblivion. Between those two I'd pick Morrowind. I liked wandering around the world and exploring. I also liked swimming in the ocean and finding all the remote caves and stuff. I liked walking along at night looking at the moons and stars. Oblivion just didn't suck me in the way Morrowind did. It seemed more tedious and I was never able to finish it.
The main reason I haven't played Skyrim is I hate how all the new games require Steam or some other online activation to play.
Most Helpful Girl
I like skyrim but I'm a sucker for oblivion, I just find that one more fun.