In reply to Mr-Cowdrey:
There isn't really a right answer, it depends more how you move. If you stop/start a lot maybe choose the warmer as more of a mini belay jacket. If you have the stamina to go for long stints then breathability is your priority.
Me personally, if I'm moving then I'm cooking and a fleece + windstopper should cover most bases, even in cold conditions. I also like to know I'm carrying a bit of overkill in the bag for when it all hits the fan. That way when the wind is howling and it's -30, I'm enjoying the view whilst everyone else runs for cover.