Depends where they are. Primal is good. Wallet of Satosih. Coinos. There are a couple of cashu wallets that give LN addresses that integrate well with nostr. I typically start with those if they have no experience with LN.
Discussion
Right true, WoS would have been my answer, but I'm in the US. Haven't tried coinos.
Bullish on more clients integrating cashu wallets, I think that's the future of zaps tbh.