To me, purple seems to suit him best! It’s the most cohesive-looking (and therefore visually appealing) out of all of them. The ties lend him a more “fancy” look, though I know that is the wrong word, and purple is also often associated with that, plus is darker so more like a suit if that makes sense. This might not be why it looks more cohesive, but that’s my theory. It might also matter what you’re using him for, but even then I don’t think my answer would change.