I recently switched from the Sitka Fanatic series (jacket and bibs) to the Kuiu line. I hunt Whitetails in Wisconsin. I am very happy with the switch. Do the research on Kuiu and you will find they use only the best materials. They are very thoughtful and minimalist in their design. I love their Vias camo (took a doe at ten yards out of a 15 ft. treestand- no worries), and their Verde camo is at least as good as Sitka's Optifade Forest.
As far as why I switched, there were a few of reasons. 1) Cost. Kuiu wins here. 2) Camo. Again, love the Vias camo- way more versatile than Sitka Optifade Forest. 3) The Fanatic series still needed to be layered for all day sits in November, so I thought I would go with something a little more "all purpose." Sitka certainly has stuff you can wear in multiple situations, but I think in general Kuiu has a bombproof system that will take you anywhere. I can still layer up underneath their Guide series and be plenty warm (I should add, I don't have Kuiu's down stuff, I'm actually wearing Sitka Kelvin pants and vest, along with a Down jacket from Montbell when really cold). But when it's warmer out, no problem- just wear the Kuiu Guide series and baselayers, maybe a sweatshirt, and you're good to go.
Downside to Kuiu is: 1) not being able to try it on; and 2) availability.
Hope this helps.