I just bought a 166 11up and it's working well for me. I've only had it on groomers so far because I haven't been lucky enough to get good powder yet. It handles high speeds well and I like the flex...not too much, not too little.
Both the 11up and CHB come with MTX or without so that shouldn't be the difference. For you, I'd take the 11up over the CHB. The CHB is more flexy and has an extruded base rather than the cintered base on the 11up.
I don't know much about the decade, so I can't help there.
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