Two major differences:
1. The Model 28 had right hand threads on the extractor rod, where it mates to the extractor star. The -2 has left hand threads. This change was made to stop the extractor rod from backing out and jamming up the cylinder. This is one change that is unarguably an improvement, IMHO.
2. The Model 28 has a four screw frame, while the 28-2 has only three frame screws. The one that was eliminated was the cylinder stop plunger retaining screw, located in the front of the trigger guard.
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Which is the most desirable?
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It is difficult to answer that, as asked. It can be an extremely subjective judgment. Collectors tend to like the 5 and 4 screw examples. Clearly, there were fewer Model 28 HPs made than 28-2 revolvers. The latter was in production for 20 years, while the Model 28 lasted only from 1958 until 1961.
On the flip side, the -2 can be thought of as a definite improvement over its predecessor, from a shooter's standpoint - primarily due to the changed threads.
So, it is really just a matter of what you want out of the gun.
The best solution is to have two of each - one each with a 4" barrel and one each with a 6" barrel.
