But we never discuss the price of bitcoin with eth or bnb, more people compare the price of bitcoin with fiat rates
That is quitely not correct. When converting Bitcoin to eth, the conversion rate is determined by how much the value is it in fiat currency.
In your opinion, bitcoin is an asset or a currency?
Bitcoin functions as both an asset and a currency. We referred to Bitcoin as an asset since its price is rising, and we are confident that it is a good investment because the price has the potential to double or even triple at any time with a little risk. We can also call Bitcoin a currency because it was first referred to as a cryptocurrency. Bitcoin payment is not yet commonly accepted, but it will be in the future. You can primarily trade with it right now.