Putting aside for a moment the named models, versus the model numbers (they all got model numbers in 1958), the 27 came first, then the 28, then the 19.
So, for a while, the 27 and 28 were the only .357s in the line. The 27 was fancy, while the 28 was "plain Jane."
The 19 came about in 1955/56 when Border Patrolman Bill Jordan suggested that the .357 should be chambered in the K frame to make the gun lighter.
Thus, until approximately 1956, you had your choice between plain and fancy N frame (28 versus 27). In 1956, you had plain or fancy on the N frame, and fancy on the K frame (19).
After 1956, most police wanted the new Combat Magnum Model 19 as it was lighter and easier to carry.
BigBill: Patton was famous for two revolvers, although he had others and some semi-auto pistols as well. He was famous for the "pair" he carried on occasion, which were really not a matched pair. He carried his Colt Single Action Army Model P in nickel finish on his right hip. Sometimes he added the left side holster to his belt and also carried his 3 1/2 inch Registered Magnum. The Registered Magnum always was the "second" gun and was always worn on Patton's left hip.
They both had ivory stocks, leading many people who were apparently incapable of basic observation skills to conclude he had a matched pair of the same model of gun.
And on any given day, then you can decide which one you like best...
