White Leghorn is the most obvious. Her tail feathers stand crazy high and fairly straight. I get what you're saying about angle now. I'll have to check that out on the different breeds. The BO chick compared to my other two is the main difference. The little ones tail is erect and makes her look "proud" to me. Ha. Vs the older ones tails have barely began to rise.
Leghorns, 40 degrees for males, 35 for females. Orpingtons, male 25 degrees, female 15 degrees. If you got them from a feed store/hatchery, they will not look like the Standard Bred birds.
If these are just chicks, I don't think you can really tell yet what they will do as adults.