The main advantage is it's decentralised cryptocurrency. Supply is limited and its global currency. Because of limited supply it's price will increase day by day. Another main reason of advantage is non hackable because it's distributed ledger Bitcoin nodes are everywhere on internet you can't hack all nodes at a single time so practically it's impossible to hack. My last and best advantage is transaction speed and there is no needs to bank or 3rd party to make transaction we can transfer money without going anywhere.
Transactions around the world are getting easier, we can transaction anytime and anywhere, without needing to think about the exchange rates that apply to a country