Entirely depends on what you're using the card for. If you're going to be using raytracing or playing at 4K, I think the 3080 would be better suited for your needs. If you're playing at 1440p or lower (Or even 4K) But don't care about raytracing, the 6800 XT is the way to go. I personally have the 6800 XT and love the card to death. Plays everything I throw at it without problems and might have a little longer legs with the 16GB of VRAM. But again, totally depends on what you're using the card for. So with FSR 2.0, you might can manage a better experience with Raytracing on the 6800 XT than currently. But we gotta see more games with it. With that said, good luck with whatever you decide to grab.
Leonidas - Ryzen 7 5800X3D | MBA RX 6800 XT Midnight Black | Be Quiet 802 Silent Base (Main)
Maximus - Ryzen 7 3700x | Power Color Fighter RX 6700 XT | Fractal Ridge ITX Case (HTPC)