I really can't answer your question for sure, but I believe that deer see more of the UV spectrum than humans do. They might not actually see color, but might see a shade or a "glow" of a different kind. I believe that camo orange would definitely be a "better" choice than a solid orange. The camo would have to help break out the large, solid color "blob" the deer sees. Anything to break up your outline would be good.
As an aside, I bought a Browning orange ballcap with a flo. yellow brim on it. I never killed a thing with that hat on, and got busted ALL THE TIME. I switched back to orange, or camo/orange and don't have that happen near as often. Therefore, in my opinion, that flo. yellow must "glow" more than the orange.