It seems as though when I have had a rifle to sell, someone always wanted to trade revolvers for it, says to me that most entry level shooters start with what resembles a modern firearm. Consequently, I have several revolver replicas. The evolution of these replicas from the 1970's, to present fascinate me. I have 1858, and 1860 colt replicas that are palmino (Italy), usually sold by Dixie in their heyday. These arms shoot well, but require some tinkering and repairs, like hands, cylinder bolts and springs. They can be made reliable. I have, probably one of the first Uberti 1858, stainless steel that is good shooter and accurate, I say first, I traded for it in 1977. It has Uberti and Gardone stamped on the barrel. Gardone being the proof tester. As of later, 6 months ago I traded for an 1858, stainless steel, pietta. A nice shooter and easy to clean. The Pietta 1858, sheriffs model in blue is what I carry most of the time. I have never had an issue with these firearms concerning accuracy, usually mechanical problems, just like the old timers had. The colt replicas are fun to shoot, looking over that round barrel and sighting through the hammer, gives the impression you are shooting right on looking down the barrel. Also, adds to the nostalgia of the old west, as seen on most TV and movies.
Fairly close call for one or the other as Pietta and Uberti are made in the same area as pedersolia in Italy. They share machinery, trade secrets and materials to produce the replicas. 1987, I toured the arms factories in Italy. The American walnut storage area was big, really big.
Back to the subject, I think either brand will shoot well out of the box, they all can stand disassembly and a good polishing on the bearing contact bearing surfaces. I have found all pistols shoot high, accordingly to the charge, for right on shooting I load 20 grains of powder and wad under the ball.
I like the appeal of brass frames, they are flashy, and have had a few, but most were stretched out by abusing the loading lever, on oversize lead, they can be fixed, and retimed, but it is a pain requiring the machinery to be accurate. I do believe the brass compounds are better now than say, 30 years ago. Again, 2 cents.
Cheers