Bitcoin is a digital currency and real money is local currency.Bitcoin price can be increased or decreased but local currency remain same.Again,bitcoins price is too high than local currency like Dollar.Bitcoin can give us many chances of getting big profit by holding it.But real money give small profit by deposit on bank.
Just let you know that local currencies or fiat money do have the ability to rise or fall, just because the difference is not much and it usually takes a certain amount of time for the currencies to increase or decrease their values. But yeah, no one can deny that bitcoin does bring us an unbelievable amount of profit thanks to its fluctuating in price.