even a lot of people holding bitcoin, some of them still using bitcoin as way of online payment. on the meaning its both to currency and asset. on its purpose that bitcoin is a great item that can be used for invest or exchange into fiat, that make the good point of bitcoin. nothing dominant from currency or asset, because bitcoin can be used as both.
Surely it act as both an online currency and an investment asset for people. People use it as online currency by making a lot of transactions online for the sale/purchase of their products and as an asset by making long term investments in bitcoins for their future purposes.