Yes, bitcoin now is the strongest currency in the world. Why? Because bitcoin makes the people to become rich and powerful. Bitcoin is a well-known crytocurrency worldwide. This is a great investment because the prices are too high. It first met people so it was strong and good job.
I do not think, to be able to say the strongest currency marketcap should be more than $ 100 trillion, but currently only $ 190 billion, this has a major impact on the price easily controlled those who have big money.