I've always had best results with Red. But regardless which you choose, what really matters is the level of intensity, hunting pressure and whether or not the animal can see the source of the light.
I've had animals react or NOT react to each of those colors and even bright white light....but you MUST consider all the variables involved and choose accordingly.
For longer ranges...I tend use Green (you can see farther with it, but it seems to wash out detail), for shorter ranges (125 yards and in) my choice is Red. For me, red preserves detail and your night vision.
Do NOT be fooled by claims that such and such animal can not see RED light GREEN light...etc. It doesn't matter that they don't see it as RED or GREEN, they SEE IT as something else (a shade of gray, green, whatever) it is NOT invisible to them, so try to avoid using any light that is too intense, the source will be noticed, the shadows it creates will be noticed.
Good luck to you.
Spartans ask not...how many, but where!