Primal is probably simpler since it's all integrated. In general, sending and receiving zaps are separate actions. Any lightning-enabled wallet can pay a zap as long as you can get the associated invoice into your wallet to pay it. In that sense they are just regular Lightning payments. The receiving wallet defined in your nostr profile receives zaps sent to you, and if it supports NIP-57 will also return a receipt so nostr shows it on that post. For instance, I use Alby to send zaps and I use Lightning Tip Bot (ln.tips) to receive zaps.