These both are facetious arguments when there are a ton of FSR 2.x reviews on this very website that show that FSR 2.x and DLSS 2.x are close.
DLSS is still better on average but saying FSR 2.x is trash or similar hyperbole doesn't align with the facts.
Cyberpunk 2077 has recently been updated with official support for AMD FidelityFX Super Resolution 2.1 (FSR 2.1). In this mini-review, we take a look, comparing the image quality and performance gains offered by upscaling technologies in this game.
www.techpowerup.com
"Compared to native TAA, FSR 2.1 image quality is a very noticeable upgrade across all resolutions"
"Compared to DLSS, one of the most noticeable differences in image quality between DLSS and FSR 2.1 is the quality of the built-in anti-aliasing. In the DLSS image, most of the edges of the game geometry are smoothed well, where in the FSR 2.1 image they have a somewhat more pixelated look. The second-most-noticeable difference is how FSR 2.1 deals with ghosting. In comparison to DLSS, FSR 2.1 handles the ghosting issues even better than DLSS at day time, but when there is a lack of lighting in the scene, the FSR 2.1 image may have some black smearing behind moving objects at extreme angles."
If you look at the image in the review, both are good. The difference between the two are minute quirks. You may be thinking of the FSR 1.0 implementation that both of those games had (not sure if Dying light has been updated to 2.0 yet although you can drop in the newer FSR version with a mod).