Not sure why you're back asking about this. You can start a new thread or ask AI.

They are quite different technically, with much greater trust assumptions for e-cash. E-cash mints are anonymous strangers that take your money and generate IOUs. Liquid is a federation of geographically distributed known entities. E-cash mints can rug you immediately and easily; Liquid is quite safe from rugging but could, potentially, be required to freeze your funds by a government.

E-cash is probably best for very small payments, like streaming payments between autonomous AI agents. Liquid is a decent way to stack sats without on-chain fees, and to get some privacy.

Neither are "Bitcoin".