I'm in the market for this, albeit for different reasons. Perhaps coincidentally, right after Google announced ending their free storage their sync started acting up for me. Even though I'm a _paying_ customer. In that circumstance the usual Google lack of support becomes quite unacceptable. For me the key feature is partner sharing. My wife and I take lots of baby photos. We see each other's photos as if we took the…
I have shared albums with my wife that are generated automatically from photos of our kids based on facial recognition, and then we have a shared album with family where we add curated photos to - as the initial album is shared, we can do this with the other person's photos, not just ours. This works pretty much seamlessly for both photos and videos.