Jenny Lake would be my top pick, but you’ll have to arrive super early in the morning to get a walk-in site. Colter Bay would probably be my next pick, and then Gros Venture, which rarely fills up.
Seconded on Jenny Lake!!! Great spots and super quiet. They only allow tent camping so no RVs and they don't allow sleeping in their cars so only available to tenters. We arrived at 5:30 am and ended up in line with 7 others, we were the first car to be turned away.