At August 8, 2017 Bitcoin forked. Now there are two "bitcoins" but just one is what Bitcoin used to be (Bitcoin Cash aka BCH) while the other one is just digital lead (Bitcoin Core aka BTC).
If you want to learn more about Bitcoin just follow @Bitcoin on twitter
you're right that BCH functionality is surpassing original BTC, but people still invest in BTC due to its name, it's purely PR aspect. Everyone already knows about bitcoin, not many people outside the community know about BCH though