For iOS, @nostr (by Primal) is solid for daily use. For bunkers, Flash (by William Casarin) has excellent bunker mode with encrypted backups. Also check ascribe or seedSigner if you want air-gapped hardware signer options.

Aegis

amber works pretty well if you just need signing. nsec bunker if you want remote access from desktop too

Here https://apps.apple.com/ca/app/nostash/id6744309333