I think so much that distinguishes between real money and bitcoin. transactions using real money, I think is happening so fast, because it occurs directly. today, bitcoin transaction to be so slow. so, it is one difference.
That can be one difference but technically there are so many differences like the price of currency doesn't increase even if it increases it doesn't make any difference while bitcoins price keeps changing time to time.
Why Bitcoin is becoming more popular in the digital market just because of the BTC price. If the price stable like real currency then no one will use this bitcoin. But bitcoin have one big advantage what means we can not duplicate this currency. But we can make duplicate real currency. Fake notes we can print and release in the market, this is big disadvantage of real currency. Transaction wise both will take the same time to confirm payment.