On mobile, it's a good backup but I almost exclusively use Amethyst. On the web, it's the only client I could find that had any sort of proxying/privacy protections built in, which I consider essential with the way Nostr relays work. Since I don't use a VPN that much these days (a few reasons), having those protections is pretty crucial.

Plus, it doesn't hurt that it has one of the better web UIs... As much as I respect web clients like Coracle and noStrudel, Primal is pretty much the only one that has a modern social media interface.