I personally like Kale's proportions the best, followed by Gwen.
I love Connor's personality description the best, but conformationally I don't like his butt/hip slope as well. And perhaps the biggest thing is he is very upright in the front pasterns. I know halter horses kind of go for that "look" but I worry about soundness issues with pasterns that are that straight. Kale's are a tad straight too, but I think overall he has the best proportions.
Gwen has the best pastern slope, but I don't think she's as proportioned as Kale. She might be the best "using" horse of the bunch though as I like pasterns that slope a little bit.
But hey, I'm not a halter judge, so what do I know!
Also, I am guessing they will change a bit as they grow.