First of all i really appreciate to your topic. Because i think every one need to learn that bitcion is volatile currency which ups and down every moment where fiat currency never ups and down though all are crypto currency. Now need to know which is better bitcoin or fiat in my opinion if any one wants to take risk then bitcoin is better because there are some possibility to increase or decrease in the price of bitcoin but fiat is always stable means never change in price. So if we analysis bitcoin price last few years then we may see that the price of bitcoin increases 100plus times. For this reason i will prefer bitcoin better than fiat.