People's opinions will be different. We prefer a concrete parking pad, cable tv and sewer plus the pool and other things at topsail is important to us with having a kid. We prefer that much more than a state park setting. Especially when you are in a resort setting like Destin. If I can help it, I would rather have those additional amenities, especially for a destination. We were there for a week.
Now being that its just a 2 day stop for you, then I would probably opt for the state park feeling. You can dump the tanks on the way out.
You can always do camp gulf and be packed like sardines and pay $100/night. Hehe.