Bitcoin does not have the backing like other centralized currencies like the USD dollar, so we can not say that its the most powerful with other countries choosing not to recognise its existence and others going to the extreme to ban it but we are on the road to make it the most powerful
bitcoin is now getting a great support from their users, and hope that very soon it also get the support of different states and governments like Japan because most of the states are going to legalize bitcoin, although bitcoin is currently not the strongest currency of the world, but if we compare it with other cyrpto currencies then it is the strongest currency, and i can expect that very soon it will even become the strongest currency of the world, when people will adopt it.