Libra is supposed to be a stable coin, is it not? If that's true, there is no real benefit in owning it for the sake of just owning it. This would be akin to keeping your money in a savings account that doesn't bear interest. There might be demand for Libra if it gets past the regulatory hurdles, but if its pegged to a fiat currency like the USD you aren't going to make a profit. I don't see the point of all this great anticipation.
Perhaps the project / coin that Facebook developers want to present will be something magnificent and innovative, but I do not think that it will be cooler and more authoritative than the same bitcoin or the promising TON.
I don't know what TON is, but Libra won't be anything even remotely close to what bitcoin represents. The only thing I can see that it has going for it is the facebook branding which will doubtless attract a lot of Libra users. That won't necessarily make it a good cryptocurrency.
I also have serious doubts about Libra even coming to market. The U.S. regulators are likely to nix it before its even born.