L.S.
Hey, I actually have been to both in my youth! I went to church camp in Turner Falls area - gorgeous! Then, I went on a youth trip to Beaver's Bend - equally gorgeous!
Turner Falls has a neat water fall(obviously!) and swimming area at the bottom. Beaver's Bend had a great wading area on the river, more of a natural experience.
Not sure about lodging since I stayed in camp dorms at TF and a person's house at BB. Both are in the hills but BB is more tall piney woods. TF has a bit of a desert feel, more bare rock. Personally, I lean toward the beauty of BB - the edge of the ozarks.
Hope this helps!
Camping tips - sleep in something you wouldn't mind strangers to see! My mom camped out for honeymoon and has horror stories of fellow campers laughing at her walking in her hot-pink robe and furry slippers! Flashlights for night-time potty trips. With kids, pack an ice cream bucket, the big gallon one with lid, and cut hole in lid to create a port-a-potty for extreme circumstances (raining, middle of night, or strange noises that make kids want to hold it but they can't!). If you line it with a couple of paper towels, it will keep it from sloshing when you go to dispose of it - lovely thoughts, but practical! Pack some toilet paper, too! Tooth brushing - spitting on ground is fun but may attract ants, so spit in remote places from your sleeping/eating area. When in doubt - sleep in the car!
HAVE A GREAT TIME!
hope this helps,
L.