Maybe I'm talking about a few yrs ago tech, but I thought mission and cartel had a superstrap and the custom had some basic ankle strap? Basically, the Mission and Cartel are more comfortable compared to the Custom. And based on the OPs experience and what Alkasqualik said, they will all feel the same unless you ride them back to back and compare.
I'm sure you'll have fun on the snow with any of those bindings you choose.
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