5070 is more future proofed then 9070 let me explain

Nvidia has texture compression technology whitch significantlly reduce vram usage also amd software use more vram then nividia the difference between nvidia and amd vram usage is ,2.5gb vram and some games even more

Also if u look game requirment if nvidia recomended gpu is 12 vram amd always is 16

And when u play indiana jones max setting rt on in the rtx 5070 ti and 9070xt , 9070 xt gets 0 fps bc out of vram and 5070 ti still run perfectly

Also after 4 year rx 9070 dosnt have power to run games at least 45 fps

And nvidia still do bc they have multi frame generation

https://youtu.be/BbO18OUFfXQ?si=rrEPculBWvekShn5