I think PopOS was made especially for the System76 hardware, no? While it can still work on other hardware, System76 hardware is the one it was meant for.
Honestly, Ubuntu is great. It's not bleeding edge where you can encounter yet unfixed bugs or other problems, and it's not old enough that you can run into problems where the software is so old it doesn't support the latest gaming stuff. It has great support from the community, it's widespread, and comes with tons of quality of life things like tools to install 3rd party drivers, like graphical drivers for NVidia. Why change?
