I really like my 24-120 f/4, if I had to go with one lens, that would be it. For me, I'll take the longer 120mm focal length over the 1-stop advantage of the 24-70. [D850 is my primary body]
But, Yellowstone? I'd bring my 80-400 f/4-5.6
This was a lens I didn't have in 2021, but wish I did. I was out west on a climbing trip, a climb that almost didn't come together, and had I not been able to secure a climbing guide, the money not spent on that was going to go to buying a 200-500 back here at a local shop at home, and have them ship it General Delivery to some place between Denver and Yellowstone, and really focus on spending time in Yellowstone that time.
With just a 70-200 f/2.8, I just don't think it's enough lens for stuff in Yellowstone. And, because Plan A did happen, money got spent elsewhere, time got compressed, objectives changed on the road, and such, I once again rolled into Yellowstone once again with nothing longer than a 70-200. And I'm not sure I even took a single photo of any animals on that trip into the park, choosing instead to just do some nighttime wide angle stuff for a night, and move on down into Grant Teton. Now, I have to say that part of the reason I only spent one day in Yellowstone was because I managed to get the one shot I had in my mind on the 2500 mile drive out there. Had that not happened, I probably would have spent a few more days in the park seeing if I could do any better this time with the 70-200 than I had in the three or four other times. Maybe.
So, I can't say how a 200-500 would have worked in Yellowstone.
But, last spring I had a new-to-me 80-400 with me in the Alps, and it was an indispensable lens. I often just had it as my walking-around-town lens, and loved it. Too heavy for me to take up into the mountains, but in town, my climbing partner looked at my photos, compared to his, and said it was like we weren't even on the same trip. I seriously doubt I would have taken a 200-500 to Europe, even if I had one. My bags were already so jammed and heavy, I was almost thinking of leaving the 80-400 behind, but I'm so glad I didn't.
Driving all the way out there? There's no way I wouldn't bring these two lenses:
24-120 f/4 and an 80-400 f/4-5.6