Best depends on the trade-offs you prefer. I'd say fedi or ecash, because they settle over LN. Both need a lot more work to replace custodial LN services still. For relevant apps there's fedi alpha and then eNuts, that I know of. Haven't used them on mainnet myself yet though
Discussion
Do you mean fedimint and cashu? I found https://coincharge.io/en/chaumian-ecash-for-bitcoin-lightning/ as resource to explain it a bit. Also there is nostr:npub1kvaln6tm0re4d99q9e4ma788wpvnw0jzkz595cljtfgwhldd75xsj9tkzv I am trying out. There is also a podcast https://overcast.fm/+BHdPKYd-oc shared to me by nostr:npub1qe3e5wrvnsgpggtkytxteaqfprz0rgxr8c3l34kk3a9t7e2l3acslezefe with nostr:npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vg about this subject, still have to listen to it. #ecash #minibits #cashu #zaps #fedimint