I'm not an electronics-tech guy, and as much as we all gather a basic understanding of computer architecture and features as veteran builders and overclockers, we develop rules-of-thumb when choosing our boards.
Since I overclock, I look for a good phase-power design spec of 10 or greater.
So for the basic Z170 Pro board, I found this:
ASUS Digital Power Design:
- Industry leading Digital 8 Phase Power Design
For the gaming version, there's no mention of the spec, but I would guess it's the same.
These boards that have been linked to this thread are all good boards. For various purposes, you can find a good board at their price-point at the Egg.
But for my own forthcoming Z170 system, I'm choosing this:
http://www.newegg.com/Product/Produ...Sabertooth_Z170_Mark_1-_-13-132-639-_-Product
and I'm willing to pay the extra $60 bucks because:
TUF ENGINE! Power Design:
- 8 +4 Digital Phase Power Design (= 12)
It all depends on what you plan to do, what processor you're using, and whether or not you're an overclocking obsessive-compulsive addict.
As for the spec, ASUS had published in its "Overview" of a Z97 board that the spec is irrelevant, and the quality of components is a bigger factor. But the quality of components on the Sabertooth is already top-notch, with a 5-year warranty and a board built to a mil-spec. So the extra expense seems worth it to me.