Brady deffinetly knows his stuff, but to put it in other terms. While both types can measure horsepower and torque, and do it with repeatable results, the load bearing dyno simulates the real world better. Plus as an added bonus with a load bearing you can do more than just make pulls, you can do road simulation, quarter mile pulls, and many other things. I've seen things done on Pickups Plus' dyno you just can't do on others.
Besides track times are what counts, who really wants to have a dyno queen? It's a tuning tool.