The fact that SN account is custodial, it makes your life easier if you use a lndhub system for them. Also for the user, they can use any other app that can import lndhub accounts (Zeus, BW, Boltcard app and soon more maybe). So you don't need to bother with making a special app for this. That involves a lot of struggle and problems with stores etc

I know that SN node is using a LND node so will be a very easy integration, I think.

Check this for example https://github.com/boltcard/boltcard-lndhub-docker