Short or long?
How do you ride?
If you are a fast and loose rider, who wants to jump, run it hard and keep it spinning at higher rpms. The short track is more playful and flickable.
But if you are a finesse rider, you like the steep and deep. If you want to maximize floatation. Go long track. Still maneuverable, but you can feel the extra length behind you.
If your somewhere in between or not sure. 129"