For me Photoprism is unusable for the simple fact that they don't support multiple users. Also Photoprism doesn't have an official app which I can easily use on my phone to sync photos.
yeah the simple workflow of the app -> immich server makes it seamless. i think that is the magic part of immich, the barrier to entry for getting your photos in (and the WAF) is key.
Photoprism has different approach. Last time I tried I wasn't impressed. Immich, on the other hand, gives me almost identical experience to Google Photos. I was heavily using Google Photos, so this is probably the reason why I am pro-immich.
I've just set up an Immich server and the UI is nice and uploading is quite fast. Waiting for Google takeout to finish so I can import my whole library....
Also your Lemmy account is marked as a bot btw. Some people block bot accounts.