Too many to list, really. One that stands out:

#Amethyst cares about user privacy.

It’s got Tor baked in, so you don’t have to worry about accidentally forgetting to enable your VPN and sharing your IP location with all these random people’s relays.

It’s also the best client on #Nostr for many other reasons—one of them is the fact that Vitor actually listens to users instead of just creating what he thinks people want.

If Amethyst didn't exist, I probably wouldn't have joined or still be using Nostr. I've tried other clients over the years, and there really is no second best.