With a cross bred bull your calf uniformity theoretically goes down as half the calves will get part of the cross while the others get the other half. If you are not selling in groups, I guess it doesn't matter. Some will have a lot of ear, some will not have any.
Not knowing the sire is also an issue as you want really know if he is bringing any desirable traits to your herd. I would cut him and buy a purebred animal with the traits you are looking for.
Now after saying all that, a good registered Brangus bull is a good choice over a group of Herefords. I have a few Brangus baldies and they are some of the best mama cows in the herd.