Europe. You just walk to the register and point out the items you want to pay for. I've never seen a place where paying for a group of 6 separately would be a problem, it's the default and expected.

Europe is a continent. In all the countries I've been to in Europe, the service was indistinguishable from that in the US, where the bill is brought to the table and paid there. Can you be more specific as to what country's restaurants do people normally walk up to a register after eating?