Here's a detailed article on this topic by CNBC:
cnbc .com/2019/06/18/the-difference-between-bitcoin-and-facebooks-libra.html
In my view, the biggest difference between Facebook's Libra and the Bitcoin is that while Libra is a Stablecoin, Bitcoin is not!
Excerpt from the articles
Further, unlike other stablecoins, Libra will not be pegged to one currency but instead a basket of assets ranging from bank deposits to short-term government securities.
Libracoin will not be just your regular stable coin in the tradition of Tether, it's bringing something to the table that other countries consider dangerous, so they banned Libra Coin, I'm still open to what Libra Coin is bringing to the table but I'm 100% supportive of Bitcoin because it is a store of value.