My Jetstream gets way more use than my Mountain jacket, guess it depends on what type of hunting? Where mine is mainly stand hunting, and only use the Mountain jacket on warmer evening hunts, that are breezy and chill off, as it's basically a very thin windbreaker.
Agree. I want to like and use my mountian jacket more. It has no insulation and no hood so it is basically a wind shirt. If myself reaching for my jetstream or other jackets far too often.
Depends what you want it for, they are completely different. Jetstream is over twice the weight, has a hood, a little insulation, and pit zips. Mountain jacket is just a wind shell.
I see the use cases like this:
Jetstream - day hunts or backcountry hunts with pack support. Works as an additional warmth layer and cuts the wind, the pit zips help dump heat. Hard to justify the weight on a true backpack hunt but its a versatile layer on active late season hunts.
Mountain - Backpack hunts where weight is important and you just need something to cut the wind and use synthetic or down for true insulation but something that breathes better than a rain shell. Personally gore wind blocker does not breathe well enough for me in active situations without pit zips to justify using the more burly material/cost/weight over a lighter bare bones wind shell (i use a 4 oz patagonia houdini).
The jetstream is my go to winter active layer for casual activities in the colder seasons too. I did a lot of chainsawin in it this winter.