I think the thing that makes that particular bitcoin is its security. The bitcoin market is expanding around the world. There are millions of transactions in the market but bitcoin still ensures the safety of investors. So bitcoin has created great confidence for investors. Moreover, bitcoin is the world's first electronic currency. It has the attention and support of many major economies in the world.
And aside from the security it gives I think the reason why bitcoin is special because it give us the potential of gaining more profit just by investing and trading of it.