This is a hard question, I love all of these seasons equally. I used to say season 1 but recently I've started to appreciate season 1 a little more, it has a certain charm that other seasons don't (doesn't make the other seasons worse at all, it's just something I've noticed). So I guess I'll go ahead and choose tie because I love all of these seasons (well, season 3 is my favorite so I guess it's a tie between season 1 and season 2).