I will take whatever is the most stable. I don't need a lot of feature, just a timeline and gallery with albums. Immich fits it for now, but it is way too focused on piling features and is bleeding edge. I hope memories has stability as its goal.
I've been using it for quite a while and had no issues with the app at all. Only one hick-up with Nextcloud itself but that was really my fault if I'm honest
Indeed. Backward compatibility is also a major goal and there have been almost no major breaking changes since v2 (at v7 currently)