Myself I like my chickens bigger. I like to buy those Cornish Roasting Chickens at the Supermarket at at least 5 pounds. Great to bake. So I would be looking for a larger bird when processed.
If you look closely Dunlap has both those Sagittas and another one called Aquilas. Not much information on the Aquilas but nice information on the Sagittas.
It surprises me that people into all sorts of projects to breed a nice meaty layer just don't try these instead.