3. Mark L (Avengers: Infinity War)
I, on the other hand, favor the one with nanotechnology over either of those. Not only does this Iron Man armor, introduced in Avengers: Infinity War, blow Tony Stark’s “Suitcase Suit” out of the water in portability (conveniently housed in a detachable unit he keeps on his chest), it is stronger, faster and equipped with more weaponry than any suit before it thanks to nanite manipulation that allows Stark the ability to create an almost endless arsenal of options. The only reason that it falls short of the suit that succeeds it, in my opinion, is that it was not the one Stark saved the world in.