Obviously, I think Simmental is the best breed. You can have Reds or blacks or spotted. They are the heaviest milk breed, with growth, & carcass. They used to be referred to as the maternal breed in continentals, but they are more than that - great feedlot cattle & carcass.
We have great genetic base. You can pick cattle that are purebred, but fit your environment - large or small - heavy or moderate milking - and the color of choice!!
Pick them for crossbreeding, use PB cows for their fertility and milk and easy calving. Use PB bulls for their easy calving with tremendous growth, muscling, and color of choice!!
But, for anyone to decide to breed purebreds of any breed - they have to realize that the initial cost of getting into a breed is high (especially if you buy decent seedstock) and the COST of promoting your cattle if you expect to receive more than the normal market price of commercial calves.
I strongly believe in purchasing the best quality you can afford - whether it PB or commercial.
Remember, even in a PB operation, a good majority of your calves sell as feeders, so you want a cow that will produce a calf with good weight & muscling at weaning time. Also, part of your income is the number of pounds that cow weighs when she is culled.
Also, cattle need to match your feed supply.