I think those GPU’s are comparable, and both are well suited to this sim.
The questions are:
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Can the AMD drivers be trusted to have the same stability that nVidia drivers have shown? History is not in their favor, but it appears they’ve greatly improved things recently.
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Do you need 20GB VRAM? Some might say more is always better. On the other hand, only VR users seems to be pushing VRAM to the limit. With your budget I think VR may be off the table - for now. Driving a 4K and a 2K monitor, and running the sim at Ultra/High settings, I’ve never seen over 12GB VRAM usage. But that’s just me (I don’t fly complex, high-polygon airliners.)
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Do you think the sim will eventually support AMD’s frame gen natively, the way they support nVidia’s? Does that matter to you? My 3090 Ti does not do frame gen, and I don’t think I would use it if it did. I’m happy with the FPS I get from my system, and from what I’ve read, frame gen introduces some visual fidelity issues I’d rather avoid.
In short, if I was looking to buy a new GPU today, I’d buy whichever one of those I could find for the best Black Friday price, and be happy going forward. If they were the same price I’d pick the 4070 Ti Super, mostly because I’ve had a very good experience with my nVidia card.