Close race between nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg and Snort.

Snort works decently as a PWA, which is nice.

nostr:npub1plstrz6dhu8q4fq0e4rjpxe2fxe5x87y2w6xpm70gh9qh5tt66kqkgkx8j has their new PWA out on the wild, and it's my top PWA client right now.