I have had both pair & the 90% and Kuiu attack pants.. Here's my take on them all.
Sitka ascent- nice early season pant, very light and comfortable.
Mt Pants- I REALLY like these, build in web belt, knee pads and covered areas on inside of ankles so boots dont rub through. Between the 2 I'd pick the Mt pants hands down over the Ascent.
I really like my Kuiu Attack pants too, very comfortable and well made. Less bells and whistles as the Mt pants have but the price also reflects this.
Im pretty hard on my equipment, all have wear marks but all have done well in the right conditions.
I wear my Kuiu Attack pants and Sitka Mt pants about the same and almost all the time. Gave my ascent pants to one of my sons. Only use my 90% pants once in awhile in late season if its super cold.
Now one of my sons bought the Timberline pants and they are pretty sweet. Just like the Mt Pants but have waterproof knees and butt. might be a option?