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The Dragon Pershing is a Korean war version. The Tamiya is WW2 but has an option for a Korean version that I have read isn't quite correct.
Patially true. Dragon actually made two versions of the Pershing: the T26E3 and the M26A1.
The first 20 T26E3s were issued to the 3rd and 9th Armored Divisions in Europe in February 1945 and were used through the end of the war. Some of their most famous (and photographed) actions were at the Remagen bridge and the battle for Cologne. The Dragon kits gives you all the stuff you need for one of these tanks, just leave off the rear fender turnbuckles and the telephone box.
The Tamiya kit is "almost" a T26E3, but needs a bit of tweaking to make it a true WWII version. Try Googling "Tamiya M26" for lots of reviews and other info.
Both kits can be made into early Korean War Pershings -- agin, check those refernce photos for details.
The Dragon M26A1 is only for Korea. Details are quite different than the earlier model, so make sure you have some good references. Also, be careful not to use pics of M46s -- the two tanks are very similar from the front and sides, but had very different rear decks because they had different engines. Most pics you see from Korea will be M46s.