I’m referring to the RX6800. I left the XT out in the chat. The two cards are not entirely different in MSFS. The XT variant will pull ahead in GPU bound games/ scenarios. Either Way, the RX6800 non XT is aimed for 1440p and it is faster than the 3060ti and 3070 but it will get beaten in RT.
If you decide to choose an Nvidia RTX card you have access to DLSS and FSR. Keep in mind you will be comprising resolution quality with either enabled especially at 1080p.
8gb VRAM is enough for 1080p however when you move to a higher resolution, run high detailed airports or switch to VR it becomes a limiting factor.