For me currency and asset is same . bitcoin is asset becuase many people keep it for their future money and because of this value people use this to buy anything that they want like paying bills or buy a stuff . bitcoin is currency becuase bitcoin give a profit to us .
Exactly it will only depend on the holder if he kr she will going tl used it as an asset or currency. Homestly speaking some people keep it for their future and for in case of emergency and sometimes also for buying things that they want and need in their life. Its good to used bitcoin in these two way to have a better future and to satisfy your need.