I don’t believe ncaa vs ohl is a clear debate.
The ncaa has conditioning challenges stemming from its shortened season and rules around student athlete commitments. The ncaa also has a talent floor challenge stemming from having numerous independent schools with varying commitment to hockey. In the ncaa, while the opposition may be 2 years older, depending on the school, their talent level could be questionable.
In these mentored areas the Chl system is an improvement. The season is closer to that of a pro, the conditioning regime is closer to that of a pro, and the talent floor is firmly set via draft/closed united system.
I don’t think either league gets to wear the crown. Maybe in the future one does as things change.