Hard to say since I only ever drove Expys with 22s on various test drives. I want to say that potholes etc arent as harsh but that could be placebo.
I have another thread called "Jittery ride with CCD" or something like that. It's possible that the CCD suspension is tuned to only work with 22" wheels but that doesn't make sense. More sidewall, lower tire pressure, and less unsprung weight shouldn't produce body vibrations where none existed before.
I still want to go test drive another Expy with 22s at some point just to see if I notice a difference.
As far as I know nobody else who has posted on this forum has both 20" wheels and CCD suspension.