I didn’t like the El Coyote because of the weak drawstrings…moving around at night, I’d work the footbox open a little, which obviously sucks in the cold. The Katabatic was great, just could have used two more inches in width. The sewn footbox of the Enigma is my strong preference for cold...
Of the quilt options you listed, I like the EE Enigma over the Katabatic Flex or El Coyote quilts I had. The one I have now is extra wide so I have (1) plenty of room to get the sides pulled in to stop drafts, and (2) there's enough space to bring supplemental insulation inside the quilt with me...
I've been working with a subcontractor who is "weary" of a lot of things; he says it in meetings with several people all the time and I haven't wanted to call him out on it publicly, but it makes me nuts.