It would be helpful for you to know what kind of camper you are. We like TV and internet, so we look for accommodations accordingly. We stayed at Grizzly in W. Yellowstone - very nice, BTW. We would not be happy staying in Yellowstone. We had reservations at Colter Bay until we realized we would not be able to get TV or use our cell phone hotspot for internet. We cancelled and stayed in Jackson.
It's a matter of knowing yourself and what would make you happy. If those things are not important to you and you want to be in the middle of nature and the parks, then you will probably like Fishing Bridge in Yellowstone & Colter Bay in Grand Teton. They are both FHU....another thing that is important to us.