I don't know how a discussion that started out as "Hyster vs. Yale morphed into a discussion about Toyota..... I think that the reason that Toyota is #1 is that they are the the best at marketing, plain and simple. It doesn't prove a thing about the quality of their products. Isn't Walmart #1?-- and no one would argue that they absolutely offer the best quality products.
There is a local lumber company that has one 6,000# Toyota diesel pneumatic as well as several of another brand truck with the same specs. Whenever they hire a new driver, they drive the Toyota down their STEEP driveway and they have to use the other brand trucks to push it back up the hill because it can't make it on it's own. By the way, the other brand trucks have an average of 12,000+ hours of use and the Toyata has about 3,000# hours and has not been able to negotiate the hill from day 1. And no, the problem isn't timing or adjustments-the truck is just plain underpowered.