FSR 2.0 offers temporal upscaling just like Nvidia's DLSS 2.0, but does not require neural network training so the technology remains open source and compatible with all GPUs on the market. As far as image quality is concerned, FSR 2.0 can be better than native resolution in some cases, but Nvidia's DLSS 2.0 still appears better overall. FSR 2.0 can also boost fps counts significantly (up to 2X compared to native resolution in performance mode).
https://www.notebookcheck.net/AMD-unveils-FidelityFX-Super-Resolution-2-0-image-quality-and-availability.608549.0.html