I will always say BTC is batter from fiat money because we can easily do any payment within very short time and accurately. And in this busy world this is very important and needed. On the other hand this is risk free and there is no middle men that we always see some problem in fiat money transaction. But one problem is still on ground that is BTC still not accepting all govt and all places. I think when it will accept everywhere, fiat money will vanish.