As a general rule, the higher the voltage, the more efficient the device. There are many exceptions to that, but it usually holds true. There have been movements in the auto industry to adopt a 48v standard as it would actually use less copper in building cars because they could use lighter gauge wire.
so from a kilowatt usage aspect, 110v is more efficient.
2013 Coachmen Freedom Express 320BHDS pulled by a 2005 F250 King Ranch CC
A rainy day camping is better than a sunny day at work.