For now, maybe USD is still the best choice because it can be used to transaction in various countries and is also used as a basis for the world economy. But if we are a little wondering if Bitcoin becomes a legitimate cryptocurrency and can be used in all countries, it is not impossible if later on in the future Bitcoin or cryptocurrency will be the best choice for transacting in the world. So in my opinion, between USD or Bitcoin, maybe at the moment the USD is the best but in the future nobody will know