We don't have any of those species up here. I have a three point splitter that he (Wolfe Ridge) made. Mine's run on a single stage PTO pump. I usually run it on a tractor that only has 23 HP, which means I have to turn the relief pressure down to about 1800 psi. At that pressure, I occasionally find a white oak crotch I can't split. Otherwise, it goes through room and everything else I've thrown at it just fine.
I think there's three basic variables to splitting ability, cylinder size, operating pressure, and wedge design. You should be able to get a 4, 4.5, or 5" cylinder from any if the big manufacturers. Unless I'm mistaken, Eastonmade is the only one doing anything higher than 2500 psi. Wedge design is pretty variable. Some like Wolfe Ridge, Eastonmade, and the one in the video you posted are pretty narrow, while others like Timberwolf are much wider. I don't know if either is "better" but the narrower ones seem like they'll cut through nasty rounds more easily.
I guess what I'm getting at is that regardless of tonnage "ratings", look at the cylinder size and pump pressure. If you see one doing what you like, chances are that another manufacturers model with the same configuration will do the same thing.