In my opinion Muun is the worse wallet to use for LN transactions, simply because it isn't a LN wallet, unless, of course what you need is to do a submarine transaction to move funds on-chain to off-chain, to the LN. It's not completely custodial, but you trust them with your funds for a little while to do the submarine transactions. It's also very expensive, compared to actual LN wallets. You can find plenty of horror stories about it here in SN.

Electrum and Phoenix are actual LN wallets. In Electrum you need to open your own channels whereas Phoenix handles them for you automatically. It's up to you what you prefer, but in both cases, unlike with Wallet of Satoshi, you need to understand LN channels, of course. I like that combo, and I have Electrum in both, computer and phones, and Phoenix and WoS in phones.

A few weeks ago I wrote a little example on how to get channels open in both, Electrum and Phoenix, in a single operation, getting inbound liquidity in a desktop wallet and a mobile wallet simultaneously, easily and for cheap. You might find it useful if you decide to use those two wallets. It'd work with other wallets instead of Electrum, too.