We use Catahoulas. As recently as 6 years ago we didn't use dogs, but there was a lot of time wasted, and more people needed to do the simplest things. Most of our work is done out in the pasture, with a bit of work in some river bottoms and swampy land. I need dogs that circle hard, and have a fair bit of grit, as we have been running grass yearlings along with a cowherd. Those idiots come in and hardly know what a fence is, let alone a dog. Need something that can break rough, running cattle, and has the brains to switch gears and just circle and bay momma cows and calves.
We don't have a good corral or pen set-up, so no dogs in the yard. Helps the cows too, they learn if they go in the yard, the dogs leave 'em alone. Doesn't take much to teach the new cows the routine every year that way. I worked with some border collies out in Western Canada in dry-lots, if we had that kind of setup I would probably have one to help push cattle through alleys with.
The other thing I like about a cur-dog is they don't need a lot of training, it's pretty well born in them. We've been lucky so far, had 100% success rate on everything we've kept out of our own litters. (That's 100% as a working dog, not necessarily as a breeding-quality dog.) Adding dogs to the operation has made a huge difference over the last 5 years, I sure wouldn't go back to doing it the other way.
If it ain't a cur, it's just fur.
Hybrid vigor: the closest thing to a free lunch.