I’ve stuck with aluminum as I tend to bash rear rims. My current rear rim has dings and dents in it and I should be replacing soon, but I’m still running tubeless on it and I’ll use it till I can’t. I’m sure a carbon rim could take the abuse better, but when the carbon cracks, as I’ve seen with friends who have them, you most likely have to replace. Price difference is way to much right now, your talking $100 aluminum rim to a $400 carbon rim.
I’ll stick with Aluminum till the price drops on carbon.