I’ve actually had a DHX5c fettled by Avalanche. It was/is fantastic and possibly the main reason I kept riding that bike as long as I did.
Avalanche basically gut the thing and use the shell. What goes in inside bears such little resemblance to the DHX that it’s pointless trying to compare them.
Why did I get it done? Because I had one if their cartridges for my Fox 36Van. It was so good, it really started to show the back end of the bike up. So, had the rear done to match.
I’ve not ridden the CC, so can’t compare directly, but based on my experience, I will always go for a simple shock with a good custom tune over a fancy shock with lots if adjustments. After all, you can only use on bunch of settings at a time.