You guys and your silly 26 inch tires!
Just kidding.
Use what you want, go with what works best for you and your given situation.
As a retro grouch who tours on paved roads with the odd gravel road thrown in I go with the 700C. But I started touring on 27 inch tires in the early 80's so I have already "stepped down" a size in tires!
I will continue to use the 26 inch tires on my MTB. As I run them at 40-50 lbs for a comfy ride off road.