In terms of power consumption over time it is actually far more complicated - when you factor in whole system power consumption and PSU efficiency, etc. and that Intel is actually more power efficient in the lower half of utilisation states the actual power use over say a month of usage can be a different story. If you are spending many hours a day gaming that is one thing, more mixed use especially if the system is sitting in lower idle states a lot can be another story again.
Intel are not more power efficient though. How many times have we been over this now. Outside of you sitting and monitoring your gimped systems idol power use AMD are miles ahead of Intel in power efficiency. AMD are literally 3x the performance per watt or more.