Direct feed screenshots, gameplay comparison I made: (Using Create button, hold to take a screenshot or press and then make a screenshot from the Create menu)
Fidelity:
Performance RT:
Another Performance RT gameplay screenshot:
Photo mode (shifts to Fidelity mode)
I honestly think Performance RT is the best mode to go for, they're pretty close to each other and 60fps is much cleaner in motion. 30fps gives the Pixar movie vibes though. Of course, you're not an idiot if you choose one or another, just pick what suits you.
Also for Pulse 3D owners, go to the menu and change the setup from "headphones" to "Pulse 3D". How different? Not sure, didn't investigate but they suggest so. Might compare later and report.