Why not incorporate both of the stances into your repetoire depending on the application. If you watch Olympic shooters in the standing position, they need a lot of front end weapon support, need serious accuracy and aren't blazing their timings, so they blade, sit their shoulder back and make great shots. At close range and in CQB, where the targets are potentially in 360 degress and the speed vs accuracy line sways toward the speed, begin to square up.
As with anything in firearms lately (magpul or VLTOR anything...) a lot has to do with setting or promoting a trend in order to make some $$$$. Why not grab the best from all the different schools of thought, and come up with your own, tailor made to your method of running a gun. Remember, you are a different beast than them, and your rig is probably different as well.
I like the 'almost squared' stance for CQB and most ranges inside 100m. Easy to walk heel-toe, pivot the torso and absorb the recoil. Outside of that I spend a little more time worrying about steadying my gun, and thus I tend to blade and support more. At 300m I look like a bi-athlete, minus the tights.
In any case, you wouldn't marry the first girl you dated after the first date, so spend some time trying all the methods before you settle.