There are so many borderline retarded answers in this thread. Why do people say stuff like "yeah it's very powerful it has high price super powerful". Jesus christ, that's not an answer. That's not even a sentence. How do you guys function in day to day life?

Anyways. The answer depends on what you mean by "powerful". Bitcoin has certainly appreciated a lot, but with that appreciation has come an increase in transaction costs. With transaction costs of >10$ Bitcoin is not fitted to be used as a currency. Thus it cannot be the strongest currency, as it isn't a currency.