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!
libra is phenomenal nowadays.
almost every time a discussion or in this forum or other social media.
I think Libra will never be able to be like Bitcoin let alone become the king of Crypto. maybe libra can be a stable coin, however, bitcoin will affect everything from its decline or growth.