Easier to keep track of your sat flow. Also, custodial LN wallets are better for receiving because they’re always online (ie. You don’t have to always have your node up and running). However, it’s custodial so not ideal for storing large amounts. And it’s also not good only support custodial apps imo. I use a self-custodial app for sending because it works just as well as non-custodial apps, and I like to support Breez. UX is great on Breez too, best of all the self-custodial LN wallets