Weta and Sideshow are at basically the same level of sculpting. Each has a per piece strength and weakness, sure, but overall you get about the same level of product. SS's advantage is similar prices but with a much more impressive presence, such as the Gimli ex. with the large Moria base and the dead orc, for the same price as Thorin on a black stand. I would chalk that up to Weta being based in NZ though.