I have never heard about the other two brands and don't know anyone who has them (they are probably very new on the market), but I'm well familiar with Bullman and NuAir tires (someone on the forum even said they are both made by Mclaren, which is a US based company). Neither Bullman, nor Nu-Air are made in China, which at least for me is a positive sign about their quality.
Anyway, first we got Bullman about 3 years ago and we really liked them because they put the end of our flats once and for all. And, we abuse the tires a lot. The Bullmans have good wear and cushioning. Once we wore them all the way to the holes (if I remember right about 700-800 hours), we upgraded to Nu-Air, which we are still running. The Nu-Air are one class higher than the Bullman -- more rubber, more cushioning, improved lug pattern for better wear, really a great all purpose tire. We got the Nu-Air AT version, which is their premium all terrain tire. They also have another version for slightly less money. The Nu-Air tires also run well with over the tire tracks, as they can absorb the debris that may get stuck between the tire and the track. Overall I think Nu-Air AT offers more value for the money even though they cost more.
So, I think we got our money's worth and they saved us tons of hassle and lost revenues in dealing with flat tires and upset customers. I think we’ll be sticking with the NuAir for quite some time. And one final thing, be careful of any Chinese tires... our regular pneumatics from there were a disaster. :usa