I think bitcoin is special because it is control and manage by yourself no third party need to tell you how you should run your investment that is why is called a decentralized platform, secondly bitcoin is the most special coin among other coins in cryptocurrency because of it potential and the row it playing as the first crytpocurrency coin in blockchain technology which make him the king among other coins.
In my personal opinion Bitcoins is special as it's not a centralised coin, it's decentralised and that saves my taxes. The very fact that I can send huge amounts across the border paying cents is a major bonus, had I choose to pay via banks or PayPal the fees would have killed me. It's pertinent to note that it's appreciating prices is what makes it desirable, as no other asset class can give such huge returns in a short period of time.