This Seeking Tech article compares the Favor Resolution Pro and Favor Performance Pro graphical modes of Horizon: Forbidden West. Both of these are running on a PS5 Pro console.
You can check out the comparisons, for both the main game and Burning Shores expansion below:
According to the developer, Favor Resolution Pro focuses on maximum fidelity with a 30 fps target.
The Favor Performance Pro uses high fidelity with a frame rate target of 60 fps.
Although no PlayStation Spectral Super Resolution (PSSR) is used, the Favor Performance Pro does appear sharper, especially in motion.