I love City, but I think there are two distinct things that make me like Origins better. First, the combat system seems to be more forgiving. A lot of times in City, I'll miss an attack, from going on the wrong direction or something. I have strung together far longer combos in Origins. Second, as beautiful as Arkham City is, its desolate, decayed state wears on me after a while. The functional and "lived-in" Gotham is an environment that I much prefer.