Here's my take on the Big 3
Kuiu, the 2 way stretch teton pant was built tough, no longer made. The 2 way stretch stuff they have now is the Sierra. The 2 way clothing articles pill much less than the 4 way stretch garments from any of the 3 makers and last longer. That's fact for items from Kuiu, Sitka, and first lite. The peloton hoodies are my favorite item from any of the camo makers. Gaiters work well also.
Sitka, the items I have are all solid, I like their lite-weight hoodie. I don't have as much Sitka as First Lite/Kuiu
First Lite. The corrugate guide pants are very comfortable but, briars/stickers will pull badly on them. I was wearing those when I killed my bull this year. Their pants are all 4 way stretch and pill badly. The wick crew shirts and hoodie are comfy but stickers tear holes in them very easily. For that reason only, I will not buy them again. The small gaiters are great for keeping boots laced and debris out of your boot.
I get discounts from all three and I keep going back to Kuiu. The Kuiu and First Lite patterns break up the human outline better than Sitka also.
Those are my opinions and experiences. Others may like another brand. Skree has been on Camofire lately so, you can call and order that directly from them if ya like too.