I tested almost all LN wallets and wrote several guides about them.
I was thinking about writing a guide about all these fees, using LN and different methods, but is quite hard to have something established, standard or fixed about fees over LN.

In this following guide for example I studied using a public node, with different techniques to see how routing respond. But that scenario doesn't apply to private LN nodes that doesn't do routing, only payments.
https://darthcoin.substack.com/p/lightning-routing-fees-experiment

Soon (maybe) we will have a standard for LSPs and then each mobile private node, could choose easily to have 2-3 LSP with different fees policies.

I use for example Zeus and Blixt with 3-4 good LSPs and with MPP activated (MPP will use all available routes for a payment). I never use a wallet only with one LSP (except Phoenix that you don't have a choice).

People should start learning all these details and all wallet apps features, not using one single app.

As I explained here about choosing the right wallet:
https://stacker.news/items/70725