which makes bitcoin different from other currencies is quite high security, no one can manage including the government. And can not be added anymore amount.
Their is Many thing which make Bitcoin is more valuable and different from other currency. Bitcoin is a digital decentralised currency. The decentralised nature make it different from all physical currency use in the economic world. Bitcoin user doesn't pay tax to their government this thing also make it different from physical currency. Blockchain technology of Bitcoin make it different from all other crypto. Bitcoin is accepted in many country and its price is also higher than other crypto currency. These above thing make it different and popular among other currency.