Thomas Shey
Legend
My go-to example for this is "Who Goes There?", adapted into "The Thing from Another World", remade as "The Thing". A good story, improved with each version. The prequel wasn't great, but not as bad as its reputation.
To some extent the older version suffers from the fact it worked under the limitations of the time it was made, so that people don't see its virtues. I've noted other 50's SF that suffers from the same problem.