I see no much difference between these two or any of the alts available out there. The whole thing runs in the same blockchain. So I don't think there is way to make them apart. It will be all about the people's choice what they want to use. Also, it's not about the price too., where bitcoin would be couple of thousand dollars worth and cash would be couple of hundred but it's not about the price for sure. There will be lot more ways to spend it. The time will come and define the fate.