I've tried several.
The Kuiu Kenai is my favorite for earlier in the year. It is very breathable compared to the others I've tried. I can even wear it on extra cold upland bird hunts when walking all the time. It isn't wind proof and needs a shell over it, but its the only puffy I don't take off every time I hike a half mile. Mine in XXL weighs 17oz.
FL Ucompaghre vest: I don't have the jacket, but this vest is similar in insulation thickness to the Kenai. I can walk more in it than any of the jackets without getting hot. It layers over the Kenai jacket well for colder weather also, day hunting late season when not super concerned about weight I may pack both.
Kryptek Aquillo: This is cut a bit short for my liking. I am not a huge fan of the hood either on it, and waterproof down isn't as breathable as synthetic insulation. It never became a favorite and I have mine up for sale now basically new.
Core 4 Element: I agree it's great for the price. When I got the Kenai I started wearing this one for work. I got a new Kryptek Dalibor II off Camofire this fall because I keep wearing my old hunting one for work. Now I've been wearing the Core 4 puffy under the Kryptek Dalibor II all winter for work and love the combo. Not as warm or breathable as the Kenai, but not bad at all.
Sitka Kelvin: Mine is a waterfowl version that weighs 32oz in 3XL. It is heavy and warm, the warmest I've tried with the possible exception of the Kifaru.
Kifaru Lost Park: This one just came in yesterday. I have been coyote hunting in some really cold weather and wanted to try a new hooded one. Its really warm and the hood is very well cut to allow good vision. It's a little more awkward to get off and on without a full zip. It weighs 28oz in XXL. The removable hood is a great feature too for when it's not windy and the hood on my FL Sawtooth or Kryptek Dalibor II is enough in my layering. I wore it all morning chopping ice around the ranch for cattle and never really overheated, I think it breathes better than the Sitka. It was 25 with a 10mph wind. I need to wear it more to really know how warm it is.
I think the Kuiu Kenai and Kifaru LPP are my picks for early and late season as of right now.