Phoenix still needs you to have basic knowledge of how LN channels work, otherwise you can encounter an “unexpected”channel opening charge of 3k sats.
Another downside are fees. This is due to it’s noncustodial and trust minimised nature, yet I had to pay at least 1 sat for every zap. It’s not much, but it adds up quickly.
That’s why #[7] is my number one zapping tool.
Needless to say that one shouldn’t keep more than pocket money on custodial wallets.
So I believe a good setup (for mobile only experience) would be an open channel on Phoenix / Blixt , where you keep most of you LN sats and a one day worth of zaps on WoS. You can refill WoS from Phoenix on a daily basis paying minimum fees and use WoS for regular zaps paying virtually 0 fees. Moreover WoS supports NIP-57, which is a killer feature.