Frankly, unless the SS one is vastly superior, I love the Hasbro one and I'd be going that option. It's cheap, but was scaled pretty spot-on (despite for years the 4" one being way too large).
I've told myself I'd only buy Bossk and "Militaries" figures from Sideshow, and then barely any PT stuff... all OT.
Sideshow is making me think I need to reconsider that because I can't afford even all the OT stuff they're putting out, as great as it looks. There's just tons of it!