The EVGA "scandal" was a storm in a teacup, with most issues way over-exaggerated.
Here's the thing about Pascal, all cards are pretty much within 10% of each other in all aspects of the cards (i.e. overclocking, noise, temps, etc). The main differentiating factors and where differences can be much higher are in CS & Warranty. So it makes more sense, to my mind, to value 2 extra years of warranty/better service (i.e. faster RMA turn-around times & less hassle of it being approved)/transferable warranty, over let's say a 5% performance increase (e.g. vs a Palit 1060). But I mean hey, if someone thinks the opposite, more power to them, there's no real counter-argument against it that I can find.
I guess real world performance in terms of fps is almost certainly well within 5% across all GTX1070s. From what I`ve read, most will overclock to 2000Mhz, with a few being able to reach ~2100Mhz. There really isn't going to be a massive difference between the best and worst cards. And whatever the difference, it doesn't seem that any particular card is much better than others, it's just luck of the draw when it comes to the GPU itself.
I did see a youtube video of several GTX1070's having their noise levels compared. There did seem to be a noticeable difference between cards, but again, they were all fairly quiet.
Warranty and CS does differ between manufacturers, and it is certainly the factor that varies the most. Therefore it would seem to be the factor that most people would look at in deciding which card to buy. However, if you are looking for the quietest, coolest or best looking card, you might decide that a longer warranty period is not so important. If your case can't accommodate a longer card, you might not want to choose that card and have to replace your case. There's also price to consider. If a card with a longer warranty costs £50 more than another card, you might choose to make the saving.
For some people, especially those who plan to sell their card after a year or two, warranty will almost certainly be the deciding factor, but for others it might not be so important.