The RTX 3060ti is by all accounts a great card and better value for money than a 3070. I suspect that there won’t be much difference between the two cards you’ve got a choice of. There isn’t much difference between any of the RTX 3080 cards from what I can see. You might get literally 2 or 3 FPS difference if you’re running some crazy over clocked highly optimised system, but thats it.
I got an RTX 3080 just before Xmas. Its a total beast of a card. I’m running it with an i7 7700 and with FS2020 there is fair amount of bottlenecking. I play other games too though and it performs great there. I do plan to upgrade to a better processor and motherboard later this year.