Which one would you recommend flashing, crDroid or Lineage? People say, crDroid is more feature-rich but also less stable, so I'm hesitant.

Sounds like the easy way to go is to get an older Pixel and install GrapheneOS or go to an electronic store and just by a phone do degoogle. Any of these other phones, it all comes down to finding the right model and configuration, and if you don't have the right specs, you cant download a ROM on them. Thats why for my main phone I just bought it preinstalled, because finding those types of phones are getting harder to find and they're not easy to find.

I miss my Pixel 6 Pro. Best camera I've ever had on a phone, especially for low light applications. Best concert photos I ever took were on that phone. It ran GrapheneOS pretty well, too.