Which GPU Should I Choose: 9070 XT or 5070?

I'm new to PC building and I'm looking for some guidance on choosing between two GPUs. I've come across the Gigabyte GAMING OC Radeon RX 9070 XT, which is around $700, and the Gigabyte WINDFORCE OC SFF GeForce RTX 5070 priced at about $900. The 9070 XT seems to outperform the 5070 in almost every aspect, yet it's cheaper. Am I overlooking something important? Also, I would appreciate it if someone could explain what makes a GPU high-end and whether either of these can be considered high-end based on their specs.