It is a very dated question. In the last few years, all industrial countries have embarked on super efficient appliances, especially refrigerators. A super efficient certification is the same in the US as in Europe.
Now on resistive devices, in Europe, the voltage standard is 220v, as compared to US 115. Doubling the voltage makes for the same power, current go down by a factor of 4. This reduces resistive losses.
What this means is for the same power, simple appliances with resistive losses(clocks, small motors, lights), the higher voltage is more efficient.