I had the same dilemma, after self hosting Immich for a while I decided on Ente.
There 3 main reasons why I went with Ente over Immich for my family photo/setup even though Immich is perfectly cromulent and easy to setup (and I have the infra)

1) Ente gives 3xS3 storage backups with compliance lock. I was a bit nervous being in charge of uptime/backups of my families photos, this offloaded it to Ente. Once you add in the same replication the self hosted cost increases a bit.
2) Following on from point 1. Immich doesn’t easily allow you to encrypt the photos at rest across users, or at least not at default. I didn’t want access to my dads photos.
3) One of my favourite use cases of google photos that ente has (and immich doesn’t without scripts) was automatically recognising a face of my daughter on all our families gallerys and moving them to a shared album.

I could get past point 1,2 but adding in 3, it made me just want to offload the hastle.

Theres 5 people using my Ente instance at £10 a month (£2 each). I also keep a running local backup of my gallery too.-----