The 15/16/15 gauge butted spoke is far weaker and less durable than the 2.0/1.5/2.0 mm butted spoke. This has been said so many times, but many folks haven't heard it yet. I know it is counter-intuitive, but it is absolutely true. You need higher gauge at the spoke ends, not in the thin butted region. Breakage occurs at the ends. Using the 15 ga (1.8 mm ends) significantly weakens the spoke to breakage at the ends compared to 14 ga or 2.0 mm. In the middle, the lower gauge is actually better as it allows the spoke to elastically stretch more under tension than higher gauge. So there is plenty of elastic deformation that can rebound when the wheel is compressed during riding. That helps to prevent fatigue of the spoke that would occur if it were to go slack. The more stretch, the less likely the spoke is to go slack and the less likely it is to fail from fatigue. Unless someone is crazy heavy, the best spokes are always the DT Revolutions or Aerolites or Sapim Lasers or CX-Rays. As Ripley would say, "Believe it or Not."