It is not true that PCSXR-PGXP does not have good examples of emulation. Of course it does. However, as your library grows, you will essentially have two problems: (a) audio emulation and (b) video emulation. both plugins for PCSXR-PGXP are NOT updated for over 10 or 15 years while Beetle HW PSX is based on Mednafen which is updated to date. Video plugins have been hacked, but have not been updated. Do you see the difference?
Yes, you will be able to list several emulator videos working fine. But it's only when you start playing using your favorite game library that you'll understand why there are so many people recommending RetroArch Beetle HW PSX for system with support for OpenGL 3.3+ or Vulkan.
What's more, you need to give examples of games you've played and remembered on the original console. Many people prefer elevation of internal resolution at the cost of missing screens, missing effects, missing menus, etc. It's not my case. I prefer first having 100% graphical fidelity in emulation, and after reaching this goal if possible some improvement. But without fidelity, I see no reason to use the emulator or plugin.
RetroArch takes time to learn, but time pays off. It is the closest high-fidelity emulation and high graphics enhancement for PSX available to those who have GPUs with OpenGL 3.3+ or Vulkan support.