From memory the Buckshot tread is a bit more closed up so should wear better on the road, but will clog quicker in the sticky stuff. I have 764s and I think they are a good tyre for the price, I get quite a bit of road noise but yeah, the stereo works still. 764 would definitely be better off road but the bighorn may be a better compromise if you do quite a few road kms and not too much rough stuff off road. If doing quite a bit of river driving especially with soft gravels, the less aggressive your tyres the better as they don't tend to dig through the surface of the gravel so easily
Bookmarks