I have both as well. Attacks work great in cold temps as long as you layer. I am starting to wear my guides less and less. Basically only if its snowy & really cold.
I'm a spot and stalk guy and I think I could get away with wearing the Attack pants 90% of the time. But often times here in MT the weather turns foul and I feel like having the guide pant is a must.. I guess I'm just trying to justify buying both pairs.. You do any hunting in Kyrgyzstan? Seriously beautiful country!