People have been asking this same question over and over on here over the year and my answer is always the same, and always has been..it's both and asset and a currency.  Currency of ANY kind is an asset.  Anything of value , is an asset.  Just like fiat currency, it's an asset and can be used to buy things ( a currency ).   Bitcoin is an asset, and it can be used to buy thing ( a currency).

There's only one correct answer here and that answer is bitcoin is both an asset and currency, period.