I cross reference multiple districts across the country with wider spectrum data wherever possible, to try and widen the reference information. I check the largest districts in California, Texas, Florida, and across the midwest/northwest sections to cross reference the Northern MA/NH district I'm personally a part of.
Generally, when I look at the numbers after the monthly close and the spectrum of cream's numbers for charts and such, it sometimes is variable one way or the one depending on special offers we've done, or other stores have done more drastically, but it's not usually a massive variance.
Edit: But in general, there's waves where each system does really well. Our store sold plenty of Halo 5 SW, just not much in the way of the hardware, and the Tomb Raider bundle is really bad, but we're still selling other XB1 bundles. It's just that they are advertising their black friday offers, and EVERYTHING gets discounted system wise. With the PS4 bundles, right now the only one that's getting discounted is the Uncharted bundle, so for people looking into the SW bundle, they might as well get it now anyway, or if they still want the ugly COD bundle (Which isn't really any better value than Tomb Raider, at all, but it's got better perception and is the much more popular game, obviously).
So, perception, I guess. Hope that clears things up. I feel like we're going to sell a lot of XB1s over this weekend that people have held off on for the last week or so, because those offers have been out there for people to see.