Which devices do you recommend buying today for the best user experience installing and using LineageOS? And which manufacturers are being most helpful to the project?
stats.lineageos.org exists. Bit basic ('big data' problems, storing ~1.7 million anonymized checkins per day in mongo...isn't the best idea).
Personally I try to stick to something with an unlocked bootloader. That was the Nexus line, now Pixels (except a/b updates are still a bit rough under lineage)