Depends what you're looking for. If it's your only 50mm lens, you'd probably be happier with the later coated one. If you have a modern 50mm lens already, then the older uncoated one would be most different with the most amount of character. Try them both on identical subjects and see which you prefer.
“Believe nothing, no matter where you read it or who has said it, not even if I have said it, unless it agrees with your own reason and your own common sense.” – quote
I myself am made entirely of faults, stitched together with good intentions. -quote