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zerospinskierSidecut radius is a good place to start to figure it out. Short vs long have very different personalities.
If you don't know, go with a shorter radius (under 20m) as the ski will generally be more natural, playful, and easy to drive around.
If you want to go faster with more confidence, and charge down the fall line harder, but you are willing to deal with the fact that it will be hard to carve and steer on slow groomers, try something longer like 23m+.