This is the way I think about it, rough analogy...
Libra = Paypal 2.0
BTC = Gold
I think Libra will be fantastically liberating and empowering for billions of people, who can use it to make micro payments for their daily needs.
I think BTC will eventually be the worldwide reserve currency, that people turn to for keeping their capital safe. Note right now of course it is way too volatile for that, but I think that is the direction it will end up and I'm making my bets on it.
While libra could be better than paypal it's also controlled by facebook which is like a branch of the CIA. Also FB was involved in some pretty serious data leaks and hacks. I don't know if I'd feel safer on FB than PP. They both suck at privacy.
You can make micro payments with many different decentralized coins. The problem is not with the coin but with acceptance. If people accepted LN transactions you'd be able to make micro payments with your good old decentralized cryptocurrency.