Verified answer

Skyrim.

I'd have to say either Morrowind or Skyrim. Oblivion was a fine game but the super baby-like fast travel methods made Cyrodill seem much smaller than it should. Morrowind had hardcore stuff such as silt striders, and no fast travel, which makes the exploration aspect of the game much more intense. Skyrim has dragons and mammoths and it's much like Oblivion except you can actually take it seriously when you play. I haven't played Daggerfall, but if my PC would co-operate i would def. give it a go.

Daggerfall. Without question.