From your question, it seems as if you are asking about which style to purchase, not which color - or am I getting that wrong? As to which is best, I only own three styles so perhaps I'm unqualified to say but of the three I own - Mackinaw, long hunter with hood and hooded pullover, I like the hooded pullover the best.
It's easy on / easy off. It looks good with or without a belt. It is almost as warm as the other two (the other two do give you slightly more material on your neck / shoulders).
After that, I think I like the longhunter next. Wearing it as designed though - with the hood/cowl out - doesn't work for me for bowhunting. The material gets in my way and makes shooting difficult. That's easily fixed though - just put the hood on first and the shirt over the hood - no problem.
The Mackinaw is fine once it's on, but IMO is a pain in the butt to put on or take off. If you take the hood / cape bit off separately from the shirt, it's fine but if you don't, it's just ungainly.
Having said that, I like all three (I've been wearing the Mack all this past week), it's just that I like the hooded pullover the best.
Pay more attention to the weight of the material than to the color. If I'm buying wool, it's because I want to stay warm. Blanket weight in a so-so color is way more useful to me than any lighter weight in the "perfect" color.