My opinion having now owned/own 6 different Monson/Norwich (no palmers) Dan Wessons is that the current maker (DW or from Norwich) are the BEST overall DW's made.
Ok, that may generate some heartburn, but hear me out.
The current norwich guns are not as nicely finished as the Monson's. The triggers come from the factory rougher then the Monson's. But. The sights are much better on the Norwich. The parts are all forged or cast and not sintered. The triggers wear in perfectly. The cylinder stop is part of the frame and does not fall out. The current manufacture (Norwich) takes care of the customers!
If I were to buy (another) one to hang on the wall, I would go early Monson. BUT, to shoot, go for the Norwich 1st, or Monson 2nd. Palmer last.