I think it's pretty equal in whether folks RV or camp. And many folks do a bit of both.
P.S. "Dry camping" is without electrical hookups. If you are connected to shore power, you are not dry camping.
And that wording discrepancy also makes trying to create statistical data out of forum posts impossible. When everyone defines a type of camping/RVing differently, you cannot be sure what they mean.
And the type of rig doesn't help either. I hear from popup owners stating that they always have full hookups and there are class A folks who rarely have hookups.