How Libra is different from other Stable Coins?

[damsix]

but backed by a basket of assets denominated across 4 fiat currencies: USD, EURO, GBP and JPY.

This is great because the Euro, USD, GBP and JPY are real money and this is the right choice rather than having to stick to USDT, PAXOS or USDC tokens.
I am sure this situation will make LIBRA more trusted because it is based on the original Fiat money fundamentals, not the stable token as mentioned above.

[Alcor]

Coin Libra is distinguished by a large set of ordinary currencies and even various securities of business structures that will provide this coin, as well as the fact that it is behind such a large social network like Facebook.
In my opinion, confidence in a stable coin will be greater if it is issued by a state or a group of states. Zuckerberg may go bankrupt and then his Libra will become worthless. This is unlikely if the credibility and the economic power of the state stand behind a stable coin.