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.
I agree it totally depends upon the person who is using it. For most people they consider bitcoin as a currency and also an asset because they are using both of these qualities when it comes to handling their bitcoin. But it is much better to treat bitcoin as an asset because of the volatility of its price you can be profitable at the same time.