Curious what extra features does the jet stream have vs the guide? Besides windstopper
I bought both last year and I am positive my jet stream is the latest version because it is subalpine. The Guide I suppose is the latest also.
Here are some key thoughts:
Jet stream
Forearm pocket vs sleeve pocket
More room in arms and shoulders
About 2" longer in the front, same length in back
Hood offers more coverage, could even fully close around my face and cinch down, and has a stiffer bill part up front
Napoleons pocket on outside vs inside
Inside of front zipper is white and shows on left side when unzipped = pet peeve
Guide
Hood basically covers from hairline and ears back
Velcro cuffs
Chest pockets don't lay as flat when empty
Tighter in sleeves and shoulders
Liner that forms pockets is like a mesh basketball jesters type material and it snags (probably my most significant peeve about this jacket)
Keeping in mind that mine is an 3xl kuiu and 2xl Sitka, they weigh the same. The Sitka is a bit more roomy. Based on use, which is about 3 trips with each, I think the Sitka is more windproof and warmer as a result. I haven't used them enough to really appreciate a performance difference apart from that.
The only real difference for me comes down to liking the liner and hood of the Sitka better and probably a preference for the fit as well. Being honest though, it isn't as though the kuiu is light years behind. It is also starting to show up in my fall street wardrobe because it is a solid color. I had the guide jacket and used it last year. I bought the jet stream on a bit of a whim to get a nice piece of subalpine kit and have really ended up liking it. I think they are both great and if I really thought about it my slight preference for the Sitka wouldn't be enough to justify the ~$100 price difference if I was choosing between the two.