Decided to check Walgreens on the way home for Silver Centurian IM, the first one was empty, they had nothing but two Namor, the second one just a block from my house had one SC IM, well that was easy.
And..... waiting for me on my porch was the Warhammer Space Marine from McFarlane, neat!
I'm more enamored with the Space Marine, huge chunk of figure with clean paint and decent articulation. Hands are super stiff and hard to put weapons in though, need a little heat. Wrist articulation isn't budging, the heat might help with that. The tiny stand is comical.
The SC Iron Man is alright. Good basic paint on a standard ML body. The articulation in the shoulders is fantastic. I hate the head on this, it's almost coneheaded and has no jaw projection. The neck articulation works but is super gappy in upward looking poses.
It's hard to believe these cost the same amount.
If you have to choose between these two, get the Space Marine.