I saw an example the other day which really highlighted the difference between breeds to me. I was at a sale with Herefords and blacks, all owned and handled by the same vendors. The Herefords were dog quiet, most wouldn't move in the ring and stood chewing their cud and had to be pushed out when the gate was opened. The blacks on the other hand, were absolute bonkers. They ended up letting most of them straight out as they just wouldn't settle and out in the yards, they ran around like cut snakes. mad. When the owner was asked by a die hard whiteface breeder why he had the blacks, he replied that his neighbours had blacks and he wanted to be able to supply them with the bulls they were after.
The whiteface averaged over $5k, while the blacks were under $3k.
Alternately though, I have been at Angus sales the last few days and their temperament has been pretty good, on the whole. These bulls have been hand fed for quite some time though, and there are still a few that don't like people. The one I saw make $38k today though was far too quiet. I had a very hard time getting a decent photo of him!