I will wait to vote until the Sideshow Stormtroopers get to me and I can make a comparison.
I will say at this point, I have the Medicom Stormtroopers, Sandtroopers, and Shadow Stormtroopers. And based on the information that can be assumed by looking at those, Obi-Clone and the Sideshow Stormtroopers' pictures and video, that Sideshow will win hands-down in most areas. Cost, sculpt, material, durability, articulation. The only general area that I can see Medicom winning in is how snug the armor fits on the figure. Medicom has a nicer-looking body suit, but it is so thick and stiff that it really detracts from the articulation. I can not understand why movie-accuracy is more important than good articulation to some on such an inconsequential detail. My own favorite body suit for the troopers is the thin spandex one that Hasbro used. So Hasbro even wins one point in my opinion.