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 .
I agree that bitcoin cam be currency and asset at the same time and it would depend to you on how you would used it. In addition to that, you can used your bitcoin as asset but I prefer to used it as currency where I cab exchange it into some valuable things.