They both work, although Pixelfed has some rough edges.
That said, there are lots of options[0]. I recall running several different photo sharing sites with varying results over the years.
I am not sure what you think they may do with your photos, but in my experience they provide an excellent service. If your family is happy with the solution you may find you are swimming against the tide unnecessarily.
I know it is fashionable to be anti Google, and I apologise to anyone who may find my remarks offensive.
If you're [more-or-less exclusively] in the Apple ecosystem, iCloud works great