I’ve been looking at the Black Ovis puffy pants and the OR Allies Collosus pants as well. Not sure which ones to go with. The OR seem like they may be more durable, but the Black Ovis appear like they may be warmer. Lots of reviews on the Black Ovis pants, only a handful of reviews for the OR pants.
I have both the Black Ovis puffy pants and the OR Colossus pants and both are great options but fit different needs for me. Both of these are very warm, the Black Ovis are about half the weight and pack a lot smaller but not even close to as durable as the OR. The OR Colossus also seem to be completely water and windproof from my experiences. Hope this helps!