I gave Photoprism a shot a while ago when it was still in its early stages. Just revisited it recently, and I must say it has definitely matured and become more appealing. However, I did notice that it's missing a few options that I really enjoy using in Lychee.
I'm already using Immich for photo backup, but that serves a different purpose.
On the other hand, Piwigo felt a bit outdated to me - almost like stepping back in time 20 years.