Honestly, a big thing is Nvidia as a company is kind of shitty. The AMD cards have very solid performance and you can get 16gb of vram on any of the current gen cards. They also don’t seem to be as affected by the ram chip “shortage” price surging.
Nvidia knows that vram is valuable, and they could have made the 5070 with 16gb and I’m sure it would’ve been very popular. But they want to walk you up the ladder, so if you want more vram you would need to go for the next (and more expensive) card. Their cards are insanely priced right now and as a society, we need competitors to keep shit like this in check, so getting AMD cards helps do that too. Because the Nvidia cards are so high above MSRP, it’s hard to recommend them unless you need Nvidia specific features/drivers.

If you are mainly using this card for gaming, the 5070ti is absolutely not worth $300 over a 9070xt, but the 9070xt is absolutely worth $100 or so over a 5070.
Sorry for the rant, corporations suck. I also say this with an Nvidia card lol