I've never heard of either one of those organizations. Frankly I've found that when it comes to camping joining a club who's benefits only work in their "resort" affiliation aren't worth much unless you are sure to go to only their parks. I didn't find on their website how many nights you got the $9 a night camping fee at any park.
In my experience a membership in a couple clubs was worthwhile. Escapees (15% discount) with a great wen site and magazine.
Passport America (50% off) the membership fee is usually made back in a couple stops at a participating park.
Good Sam will also get you a discount (10%) but will get you slammed by junk mail as well.
I avoid anything that has a time share feature or limits as to time of year you can use it. If the membership is something you have to sell to get rid of, run, don't walk away from it.
