Also interested in this. I've been running photoprism for several years now using their docker image and don't really have much to complain about but always open to other alternatives.

One thing Immich supports which Photoprism doesn't is multiple user accounts. That doesn't really bother me too much but it's a pretty big advantage.

Edit: Actually one thing I can complain a bit about is the object recognition accuracy. Face recognition I think works decently enough but objects are frequently not identified in my photos. How's Immich in this regard?