It's private and you can hold it yourself. Fees are cheap. Blocks are fast. And now it has more expressive smart contracts. You only need trust liquid federation and the trust model makes it so that it would be extraordinarily unlikely for a majority of the federation to collude to steal funds. 12 out of 15 functionaries must agree and sign each block. The functionaries are overseen by the federation members which there are a ton of now. That's all overseen by full nodes verifying everything that you can run yourself.

Essentially I would personally trust liquid with at least a few million sats. I don't think it's something I would personally keep more than a quarter of a Bitcoin on it though. That may change of course and that level is different for everyone. But it's a great tool to have a few million sats on if and when high on chain fees happen and you need to do anything with lightning. You scan swap liquid to ln, so it's really cheap to manage liquidy on a lightning node with liquid even in high fee environments.