Bob, I'll tell you what I know about Bison from spending a few years on a couple ranches that had a bunch of them.
Bison move a lot more than cattle, dont come to water as much, and when they do water, they all come off the hill, get a drink and head back up the hill.
Unlike cattle that would just as soon park their asses in the nearest riparian zone and stay there until they die.
According to my friend Dave Dixon who manages one of the ranches I worked on he likes them better than cattle for the following reasons:
1. They defend themselves and their young from predators much better.
2. They rarely drink water in the winter, they eat snow instead and prefer that over open water.
3. They dont require any help calving, unlike cattle.
4. You dont need nearly the cross fencing and you dont have to keep chasing them up the hill to new grass.
5. They require less supplemental feeding in the winter, they move a lot of snow out of the way.
Some things Dave didnt like:
1. Occassionally one will decide he/she needs to get out and roam several miles, but apparently thats taken care of easily by filling the freezer. Most stay home, and those that dont, live short lives.
2. They dont like being pushed or herded, but luckily they usually dont have to be and Dave found that they follow a feed truck more readily than they take to being pushed.
3. They can get mean with age.
4. They are way faster and more agile than cattle and also way faster than people....
I think they're overall easier on a given piece of ground, in particular much, much easier on riparian areas, than cattle.
Dave liked them because they didnt require nearly as much babysitting as cattle.
