Enjoy America is normally sold with something like RPI and 'mostly' includes membership focused resort/ campgrounds that often are not in Passport America. Though there are several Encore Resorts in both PA and EA.
Similar restrictions with each park being different.
Either Enjoy America or Passport America, or both, are fine values - if you use them. We have PA and stay at PA parks only two or three times a year while traveling, but those stays more than pay for the membership.
Neither program is designed for 'destination' camping - where you plan to say for a week or longer.