If your model is 100% recurring membership and you already have a big audience on YouTube/Twitch/Spotify, Patreon is still the most mature and recognized. If you're just starting with tips and standalone digital products, Buy Me a Coffee or Ko-fi are the lowest-friction options. If you have your own blog/site and just need the membership engine embedded, Memberful.
If you want to combine memberships with selling standalone works (books, albums, courses) in a single profile, with a portable email list and an explicit AI training opt-out, Publica Now is the most complete multi-format option on the list. If your offering is pure newsletter without other products, Substack positions itself better.