If you use them - either option would be worthwhile.
Just be wary of people / salesmen - telling you how great the benefits are and that you can camp elsewhere for free or very low cost.
There are companies that specialize in that, but many ownership programs do not.
Finding a location is a bit difficult. A couple we know bought a place in the Rio Grande Valley of Texas, after spending 10 winters in the area. About two years ago, they found a place they liked, and spent another winter there - just to be sure.
Some RV magazines have ads for spots, you can also call parks in the area where you want to stay. Personally, I'd only consider an ownership plan if we stayed in the area/ park several times over a few different years. To make sure that was where we wanted to anchor.
My father's idea of camping was to take the trailer to the same lake, the same COE campground as much as possible. One year, he and mom spent 183 nights in the trailer in that one campground.
I prefer to travel. Two weeks, and I get itchy feet.
Full-Time 2014 - ????
โNot all who wander are lost.โ
"You were supposed to turn back at the last street."
2012 Ram 2500 Mega Cab
2014 Flagstaff 832IKBS TT