What is more encrypted ?
Bitcoin or Bitcoin Lighting ?
Bitcoin blockchain is a public ledger, not private one and it is not a darknet too.
You can achieve privacy and anonymity if you use a good wallet software, non custodial, open source, with Tor connection, run your Bitcoin full node, and use your inputs, outputs, change addresses carefully.
Bitcoin Lightning is off-chain, not on-chain and people can try to use it as mixer but there are technical and security weakness with Bitcoin Lightning Network and can be exploited. Be careful if you want to use Bitcoin Lightning Network to move big funds.
With Bitcoin on-chain, your can get better security and it's better if you want to move big fund.