image stability comparison
left: the latest version of PSSR
right: DLSS version 3.1 (the most current version is 3.8)
in a static scene, DLSS is clearly a lot more stable, but this is no huge feat as you don't even need a ML algorithm to get a super sampled 4K image out of static scenes. (PSSR just needs a separate sub pixel jitter pass)
And now this is the real deal where in a moving scene, the current version of PSSR is on par with DLSS 3.1 in terms of the image stability while maintaining higher image clarity.
I'd say in a technical point of view, the current version of PSSR has surpassed DLSS version 3.1.