Best costume would be AOU if you removed the red on his arms and maybe his chest. I was super hyped when I thought the CW costume would have scalemail due to the concept art, but I still like it.
Even though I technically prefer the AOU and CW outfits, I fucking love the Nomad costume. Primarily because I have a boner for "fallen" arcs where characters are outcasted or abandoned, travelling the world growing a beard and being jaded. I'm also pretty hype for the fact that he has a scalemail layer underneath his suit, I hope his suit gets more beat up as the story progresses fully revealling the scales.
I also like how they handled Cap's ideology and motivations in the MCU. His rebellion in Civil War is much more compelling and justified than it was in 616.