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Is the power consumption really going to be noticeable on your electricity bill? Not sure if you are in US of A but here everything dwarfs compared to the AC usage. Then might as well look at GTX 1060, 240 watt vs 120 watt...
I would suggest going with H170 mobo, they are more popular and will have greater choice, B series iirc is more of a business mobo, greater reliability for always on PCs but less bells and whistles. On a more technical note, those have lesser PCI lanes, might not have 16x or might not have full range support for m.2 drives... but I am no expert, do your research, don't take my word for it.