Since you're in a SR+, you will still have to carry chains and put them on, if it snows more than lightly, in the mountains, correct? If you were in a LR-AWD, with CC+, you could avoid the chains? If the first answer is yes, then why not get the better tire for most of your driving conditions, since you'd have to put on chains if it snowed heavily, either way. And in light snow, just take it easy for those once a year trips.
Actually this is for the stealth performance so it is awd. I was mostly trying to make the impression that the true snow handling was going to be rare and not make it a big factor in my decision making process. As you put it, the issue is what is the better tire for most of my SoCal driving? To me, better is great efficiency and comfort over sport handling. I think CCs tick the comfort box while not sacrificing too much handling. The last issue then is efficiency. Are the CCs more efficient? The $64M question.