On iOS, you are tied to using Primal’s built-in wallet when you want to send zaps (no NWC). I use both Damus and Primal to zap from. Damus on iOS allows easy NWC. I switch between these iOS clients depending on my mood and service status. In either client, you can receive zaps to any LNURL capable lightning wallet address you own (just add it in your profile settings - I flip between using my Primal, Strike, WoS and Coinos addresses for receiving zaps). For a NWC compatible custodian wallet for sending zaps via Damus, I use Coinos. As a side note, your Primal address also doubles as a NIP-05 which I use in Damus too. Means I don’t need to bother with setting up a NIP-05 identifier on my own domain like I used to.