Also looking at Yellowstone & Grand Teton this summer. This time with some guests onboard. Been to both before. Prefer the Tetons. Also prefer CGs inside the parks. Don't like commuting. Private CGs outside the parks are, well, like private CGs anywhere. The elevation is high. The nights are cool. There is no need for AC. An awfull lot of gas for the genny can be bought for the difference in price between the outside of park private CG & the inside dry CG price.
Part of the magic of the parks is drycamping inside the parks. We are self contained. Who needs power or water? Last time in Yellostone we did Bridge Bay CG. Nice CG. Had a thunderstorm go through. The lightshow, without electric lights all around, was fantastic. This time we are looking at Grants Village. They do reservations so I guess we will have to make some.
Spent 5 days through the July 4th holiday at the Tetons Gros Ventre CG last year. Nice CG. No reservations. No problem getting a site for our large rig. This time we are looking at Colter Bay, dry camping section. Again a no reservation CG. Get there early afternoon & don't anticipate a problem getting a site.