There is roughly about a 24% difference in frame rate from a 3070ti to a 3080. There are benchmarks on YouTube for that scenario. This one will give you a good example of the differences. https://youtu.be/Wneshmy-UPA?t=811
Personally, I opted for a 3080 myself. It's a pretty substantial difference. It's about a $100 to $200 difference depending on the models compared. Not a bad upgrade to keep you going for a while longer!
The engine used by Doom Eternal favors Radeon so if that's your #1 game, also consider a 6800 XT.
I think Halo is the reverse, it prefers nvidia
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