I've owned both. I sent the Parker Repo (12ga Quail special) back for ejector repairs twice. I used it for skeet shooting and put about 6000 rounds thrue it before I sold it. It was a nice gun and I was impressed with the fit and finish of the metal. Never had a problem with the single trigger. I only sold it because of it's limited use in that configuration. My Arietta also had some mechanical problems. It is a 28ga and those problems cost them the sale of a higher grade gun in 12 ga. I use it for skeet and hunting. I broke a mainspring, had another made. Broke the left hammer,had another made.Broke the ejector trip shot it like that then the hammer that I had made stopped functioning. Sent it back to Arietta and 1 1/2 years later I got it back. I've been shooting it now with no problems for 5 months. I guess you will have to decide for yourself wich you like better. Maybe it will boil down to how it feels and fits. If you are only hunting with it you may not have the problems that I have had with the volume of shooting that I do. I like both guns and bought another Parker repo recently. I wouldn't let the fact that they were made in Japan or any other foreign country deter me from buying one. How long are we suppose to hold a grudge against those people? They can make it at a price that you and I can afford. I certainly can't afford the Remington made Parker at 50GS. The fact that the Parker repo is a reproduction only means somthing to a collector,it means nothing to me. I use my guns as much as I can. I may be embarrased to admit this but there have been some nice quality guns that come out of Japan. That is the sad truth.
