Well, Stratos definitely makes the promise of extra safety and durability, not just with the assurance of giving 4-6 extra security poles from the standard, but also in the number of other guarantees--such as the 10-year warranty!  So, don’t just look at the poles, which may only be the icing on the cake!  The PVC foam and rubber on the poles add to it.  Look to the push pin bolt technology that keeps the structure more secure than welded joints.  Research the gold-plating and zinc ionizing process that prevents corrosion.  Take into consideration the ATSM certification and W-shaped rafters.  All of these add up to a possible standard of excellence.