Ascents are going to be lighter than the attacks, but attacks are a good all around pant. The hip vents on the Attacks are awesome, but they would get hot in early September. Sitka pants are a lot more snag resistant, but they have spandex (or lycra I can't remember) for stretch, which does take longer to dry when wet. He new Alpine pant material is awesome, lighter and tougher. I've noticed my Kuiu pants seem to dry better than my mountain pants ever did. The integrated belt in the sitka pants make them a little easier to adjust, especially under a pack belt. I have to have the Kuiu pants hemmed and taken in usually. The sitka material is a little shiny as well.
Beware of Kuiu sizing, it's different between models. The Alpines are way looser than the attacks.
You can't really go wrong with either, hope the rambling helps your decision....if I had to have 1, the attacks would probably be it.