I bought my Parker Hale Volunteer actually before the Whitworth in 1982 or 3, I think. So whether it's a Rigby, probably because of the purchase date, or a Henry I don't really know. I then got a 3 band Enfield a year later and the year after that the Whitworth.
Don't get me wrong, she shoots fantastic, I've mostly gotten 3 shot clovers at 50 yds, so long as I'm doing my part correctly, but I get them almost constantly with the Whitworth.
They're both grouping about 5 shot <2" at 100 yds and <3½" at 200 yds but the Whitworth's are just a wee bit smaller. I just think that the rifling is not quite the same...it seems that it might be off maybe 1" or 2" in the twist. It's close but just not quite right.
I'm not the only one to experience this. I've had about 20 friends try shooting them and everyone has had the same results. I did not allow bias to come into the picture as I told them that there was no difference between the guns before shooting.
I can certainly live with either of them and am glad that I don't have to buy a new one, now...From what I've seen and tried, the quality just isn't there, at least not compared to the ones from the 1980s.
I can't say that they're better than anything out there now, as I've not seen all the makers of Enfield replicas, but I think that I would still buy a Parker Hale over anything else.
I also presently own a Sharps rifle, a Spencer carbine and a Henry rifle. I can fight both sides, Reb or Berdan sharpshooter or just a member of either sides' line companies. I still need to get for my collection a Zouave and a Springfield rifle and wishfully a Maynard and a Smith carbine.