I believe that they're popular mainly because well it was the first of all cryptocurrencies to be made. Honestly most of the other coins are scams and greedy ways that the developers make money. The only other coin I can think of that isn't a scam are dogecoins! What do you think?
Bitcoins is the first crypto currency launched . Most of the people now only trade with bitcoins except that there are thousands of more crypto currencies available in market. Bitcoin comes with a special many benefits. And advantages like It's global currency, meaning you can transact to different countries it's easier since you don't need to convert your local money to their local money.
The biggest advantage of btc is that users can sit in one place and still be able to make transactions easily and make a significant profit.You can earn bitcoin no matter what's your age, no matter what's your gender or race.It reduces the unemployments in the society.The btc is gaining momentum for exactly the same reason - the global consensus towards the btc is constantly being strengthened. In this case, unlike gold, the cue-ball is not only a measure of value, but also a settlement system.