I just look at overall balance. If you don't focus too closely on any one part, the balance shows. Peach and Blue have the most balance and you can see how they naturally stack without falling back or forward. margarita is right there too. The others don't have it *at this point* quite like the top three.

Though, you never know until they are mature. I am really good at picking puppies. Better than I was with foals. Most everyone feels I have the pick bitch from the Cinny litter, and I picked her at birth (luck)