I fished with Spinner Fall about 5 years ago. Fished all 3 sections. Great guides and had an excellent time. I caught the Cicada hatch and never used anything but a dry over the 3 days. Never got a fish less than 14" and got a few 20+ in the "C" section. My impression: "A" section has most fish (and fishing pressure), "B" was most scenic, and "C" had biggest fish.
There is also the BEST outhouse I have ever encountered on a fishing trip. There is an area on the far side of the river where there is a small corral for horse trips. The area is managed by BLM and the outhouse was first rate! Very clean, with a fan and light powered by a solar panel.
The only disappointment was the Hotel: Flaming Gorge. The accommodations were mediocre and expensive and the food was also mediocre and expensive.If If I were to go back I would look at an Air BNB, or similar and cook my own food.