Maybe its just me...but most of the guys up here agree that the 50/50 twill is a much heavier and hotter fabric than the 50/50 ripstop. I have both uniforms side by side next to me and I can tell a noticeable difference. Rick
Same here. There is a reason why 50/50 NyCo Twill is referred to as "Winter Weight", and the ripstop version of the same blend referred to as "Summer Weight".
After having worn both in a hot humid climate during BCT, I can say without a doubt that the twill breathes less, dries slower, and retains more heat than the ripstop. As for fading, it's about the same but the twill seems to fade a tiny bit more.
For garrison, I prefer the look of a starched and pressed twill BDU over the ripstop treated the same way. Then again, I can count the number of you that this is relevant to on one hand.