Sold Pico 4 and got my Quest 3 this week. Will probably send it back to Amazon because one of the controllers is messed up (squeaky and mushy buttons). Honestly, I was just curious about Q3 and I didn't see a reason to hold onto the Pico 4 for much longer, hoping Pico 5 is released next year.
PQ, SDE, sweet spot, system performance (8K playback, scrubbing speed), FOV ... all this seems about the same.
Pico 4: much better comfort with the stock accessories and for me also better passthrough (unreadable phone and warping on Q3 PT)
Quest 3: much better app store - all essential apps and for those who care - much better game selection, including mixed reality. Also wireless PCVR works great even without Virtual Desktop.