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MS vs ML Colossus notes.
Their hands are nearly exactly the same size and design, so someone who wants to repaint the ML's open hand could use it seamlessly on the MS.
The MS' neck peg would have to be altered or replaced to fit the bearded head, since it's too long.
Arm and leg articulation have the same number of points, but the ML gets a little better bicep curl, while the MS gets better range from its knees. ML has better range at the hips, allowing for more stable and dynamic posing. And the fact the MS's ball jointed torso gives it lateral movement is a big bonus.
ML's gauntlets are glued on and not removable. They are separately molded pieces, but the forearms are molded and designed specifically to be covered up.
MS is still my favorite for old costume and brighter metallic color, but ML wins for stability, and beard.
And a note about Shatterstar: it's on the same body as comic Dr. Strange, but with new arms. The arms' bicep cut disrupts the sculpt once the arm is twisted, and the sculpting of the shoulder and bicep pieces prevent the arms going straight down. I'm still happy to have a figure of this character, though.