Simply put, and from my own experience, the Wylde chamber makes extraction problems much less likely, and it does make the barrel more accurate. Rock River Arms offers many models with the Wylde chamber. What's not to like?
A slightly more generous chamber to ease extraction, and a shorter leade for the projectile to jump to the lands = much better accuracy. If you also go with the stainless steel barrel, you also have the benefits of a chromed bore. Easier to clean, corrosion resistant, longer lasting, without the slight loss in accuracy. If you're only going to have one AR, why not spend just a little more and do it right the first time?
