Bitcoin created to be currency but bitcoin now is also good asset due to the increasing price of it. There is no problem whether bitcoin is considered as currency or asset, Bitcoin is a medium of exchange that better than the current currency that we use for daily life.
Does it matter if bitcoin was a assets or a currency? No it does not. In theory , bitcoin is currency but these days practically people are using it as an asset, a very valuable asset.
The thing which is far more important is how much one holds the bitcoins, the more you have the amount of bitcoins, the more happy you are seeing the price rise of bitcoins.
Bitcoin is both, as asset and a currency. Bitcoin is currency because you can use it anywhere in the world to buy anything and pay your bills in bitcoins, and it is also an asset because bitcoin is a digital coin business. You can invest in bitcoin and after some time when the price grows more you will earn a lot of money without any struggle. It just need patience to wait for some time.