Use the West - I have a good idea where you are at, having lived in TX till recently - they are one of the Local mills. Overall, the composition, including the 20% protein, is superior for most purposes.
That said, one caveat. BOTH feeds have a LOT of calcium. That's fine for your layers, and if you are raising meaties for quick slaughter, its not likely to have much negative impact before the axe comes down. In the long term, however, high calcium feeds are not good for non-egg layers - the calcium builds over time and causes a host of problems (kidney problems most pronounced, but certainly not exclusive), particularly in your Roos and can shorten the lifespan of the whole flock. If your hens are a breed late to lay (such as the Brahma, often going seven months or more before starting to lay), those birds also have a lot of time in which calcium can build up in their systems and cause damage.
I'd love to offer math, but this is a case where "the dosage is the poison", and there are too many variables involved of time, quantity eaten, breed of bird, individual genetics and laying characteristics to give a good formula. Just be aware that more high calcium food, and more time eating it before onset of lay both contribute to build up of calcium which can eventually cause damage.