Bitcoin is one of the most popular currency than other cryptocurrencies,because bitcoin is decentralized currency and easy to make online transactions.bitcoin is digital currency and an asset,bitcoin is own business and it very helpful to earn money.so thats why bitcoin is better than other currencies. 
Due to the price Bitcoin is popular among the Crypto Currency.As like a gold you can inverse in Bitcoin and get profit from it.So only it's called as an Asset and you right time to inverse in Bitcoin.