Until I started using Equal I had the tires balanced using weights. They were spin balanced off the coach so if there was an imbalance in the brake drum that was not addressed.
The tires were out of balance almost immediately and rebalancing was also temporary. If I were to say it lasted 10,000 miles I would be lying. The net result was wear on the tires that was so uneven you could feel it. The tires also cupped on the edges despite constant monitoring of tire pressures.
I have never experienced uneven tire wear since using Equal. I have never felt the coach shake because of an imbalance like I did when using weights.
Others may have different experience, but Equal (or its equivalent) works for me, and I am guessing the Centrimatics also work well. I would rather talk to a bus fleet operator about what he recommends than the "guy from the tire shop".