This has been an interesting thread for sure!! As far as working on them, it takes just as much time for either (we're talking new offerings here)! Both manufacturers have their "in house" problems. The time it takes to correct the arbor on an Uberti is offset by the extra time it takes to deal with the action parts in the Pietta. The parts in the Uberti are probably the finest ever offered in a C&B revolver whereas the Piettas are closer to modern versions of the '70s parts. With Pietta's though, you can "mix and match" barrel lengths (make sure you stay "in caliber"!) to make your own " fantasy " revolver. Also, you can't ignore the price of Piettas. When you keep your line of products to a "one size fits all" configuration, you can keep prices low. On the other hand, Uberti offers Walkers, Dragoons, pocket revolvers in various models in pretty much the correct scale (all with excellent action parts) so, the cost reflects the parts quality and the variety. Sorta "you get what you pay for" thing.
If you want to throw in ROAs, they are without question the finest C&B revolvers ever produced but of course, copies of nothing (except maybe a C&B version of a Blackhawk). But, like all things mechanical, they can be improved substantially!! Like removing the spring and plunger from behind the trigger and using a torsion spring in the frame for it. A redesign of the bolt spring allows for easier installation of a bolt block. And, an adjustable action stop completes the additions/redesigns on top of tuning/adjusting the action. The result is an even more robust and mechanically accurate ROA!!
Of course, the previously mentioned Uberti and Pietta revolvers (sorry, no Paterson's) can also be brought up to the coil spring reliability and action toughness of the Ruger. This includes Remington's which is a first for a coil hand, bolt and trigger spring (this extends to the '75 and '90 cart. guns as well!)
So, no matter what flavor, none are necessarily perfect but they are all worthy of a place on the shelf or in the holster. I'd hate to ever loose Uberti or Pietta!!
The photo is an ASM action with a coil/ torsion spring conversion.
Mike