I haven’t done it yet as I’m still shamefully dependent on NFC payments, but most Pixel owners who have installed a custom ROM seem to prefer GrapheneOS. It’s literally made for Pixel phones:
GrapheneOS has official production support for the following devices:
Pixel Fold (felix)
Pixel Tablet (tangorpro)
Pixel 7a (lynx)
Pixel 7 Pro (cheetah)
Pixel 7 (panther)
Pixel 6a (bluejay)
Pixel 6 Pro (raven)
Pixel 6 (oriole)
Pixel 5a (barbet)
Pixel 5 (redfin)
Pixel 4a (5G) (bramble)
Pixel 4a (sunfish)
The following devices are end-of-life, no longer receive full security updates and are supported via extended support releases of GrapheneOS:
Pixel 4 XL (coral)
Pixel 4 (flame)
We provide extended support releases as a stopgap for users to transition to the far more secure current generation devices.