The New Vaquero is a lighter duty (slightly smaller) frame and cylinder that more closely matches the Colt, and therefore "can't" take Ruger-only" loads, but intended instead for SAMMI spec (20-21k, etc fine) loads, I.e. "Normal" loads--not just reduced "cowboy loads" as some will say.
Howdy
The official SAAMI Max pressure for 45 Colt is 14,000 psi, not 20,000-21,000 psi.
The Uberti Cattleman is made by Uberti. Beretta owns Uberti, but the gun is made by Uberti.
As far as rugged and durability are concerned, although the cylinder, and therefore the frame, of the New Vaquero are slightly smaller than the 'original model' the New Model is just as rugged as the 'original model'. Don't confuse ruggedness with how much pressure the cylinder can take. the cylinder and therefore the frame of the 'original model' Vaquero was more massive than the cylinder of the New Vaquero, so it could tolerate higher pressure than the New Vaquero cylinder can. But the internal parts of the New Vaquero are just as tough and reliable as the parts inside the 'original model'. Some parts are the same in both guns. Although you cannot fire Magnum level ammo in the New Vaquero, you can still use it as a hammer to mend fences and you won't hurt it.