The rat tail only comes from cattle with the diluter gene. I guess in some commercial herds, there may still be simmies with the diluter gene, but you would be hard pressed to find it in a modern PB Simmental herd. BTW, that article is 11 years old!
Years ago, we used to get curly haired diluted calves. They performed as well as any animal on the farm. Have shown a few. Trust me, if an animal didn't perform, it sure won't show.
I understand that there has been some research saying they did not perform well, but I believe the more recent articles proved it was cattle on feedlots IN THE NORTH, because they had so little hair the cold bothered their performance. Of course, I'm slightly considered in the "North"
I think it's more of one of those things that the feedlot buyers can use as an excuse (another one) to discount. Reality of not, I do understand they are discounted. But, if you have a black Simmental, there is absolutely no possible way it will pass on the diluter gene, because he cannot have one to pass on!! Now, a red Simmie, could be dark red and be harboring the diluter gene. Red's don't necessary "express" the diluter gene the way we expect (like being yellow).
Back to the original question. Cont x Cont should be a better performing cross with British cows. (most hybred vigor).