I believe bitcoin is both currency and asset. Due to transaction delays from network congestion by the end of 2017, it is increasingly considered to be digital gold due to its scarcity. Once the Lightning network get deployed, we will see it being used as a currency and store value.
Well, bitcoin has a lot of functions, one of which becomes an asset, and the other becomes a tool of transaction, or investment tool. so many functions and advantages of bitcoin so many people need it.