I agree with my friend the Dusty man and the other sparkies. The motors what you call "power output" is the same if used at 120 versus 240 volts since P = E x I and when the voltage doubles the amps is halved. 120 volts x 10 amps = 1200 watts or 240 volts x 5 amps still = 1200 watts.
HOWEVER if I had my druthers, I'd run it at the higher voltage.
GENERALLY SPEAKING There are wasted I Squared R heat energy losses in resistive conductors (even copper wire has some resistance),,,,,,,,, anytime you can reduce voltage drop across a feeder line that's a also a good thing,,,,,,,,,,,,hey copper is expensive and anytime you can save on wire costs I'm all for it.