$100 isn't a significant difference, especially for someone planning to build a new PC. However, the Nvidia card is simply better at pretty much everything, so the $100 price difference is a silly thing to consider. The RTX5070ti has better thermal performance and lower power consumption. Most importantly nvidia card offers more advanced technology. The RTX 5070 Ti can run even PT games quite well and especially with FGx2 and MFGx4. Nvidia card also supports ray reconstruction, which makes PT games less noisy. What's more nvidia cards can use DLSS 4 in an extremely wide range of old and new games. If I were building a new PC right now, I would choose the 5070ti over 9070XT, even if the 5070ti would be priced at $1000, because at least I would be happy with my gaming experience. The 9070XT is cheaper for a reason, but at least AMD has improved FSR4 image reconstruction to the point where it's usable in games that support it. However, FSR FG is still nowhere near as usable as DLSS FG, and I wouldn't want to use it even if I had no choice.