Why was the gold standard better
It was like securing the value of your Money. With no Gold Standard, your Money has a relative value that is not guaranteed.
and what could happen under a bitcoin standard?
Bitcoin Standard is only going to stay an imaginary scenario, or so I believe. I really, really doubt there will ever be a Bitcoin Standard any where in the World. Simply because even Gold is easier to manipulate than Bitcoin is. Bitcoin is Transparent, keep this in mind. Most of the World is corrupt. They would never agree to backing up their own Coin in a Transparent Currency. In fact, I do not even know if it is possible in fact to have it as a Standard at all. Seems much more complicated than having Gold was.