Keeping the Custom?
In my opinion get the Westmark. I've ridden the coda and the Arbor shape is just so playful. The Westmark I hear more so (Park system with blunted edges etc.) which is why I'm excited to take it out.
Not keeping the custom? Yikes, that would make it tougher and Maybe I'd go with the Proto?If you have a small mountain then the Westie should be fine.
You can butter with a proto.