chipj (#20), you said, "what's better?" For what? Or did you mean, "which is best?" to which I would again say, "For what?" but it's an entirely different question.
All that to say, exactly what do you shoot?
Pedantic, yes, I know. But.
The Nikkor 50/2, of course.I own four of them, so I would have to say this, wouldn't I?
I also own a Micro Nikkor 55/3.5, the first (original) version. Sharpest lens in my arsenal. As I rarely shoot close-ups of anything now, I hardly ever use it. But it's still sharp.
As well I have an old (circa 1969 or so) 50/1.4 I picked up cheaply at a flea market. It has a very small chip in the front element, which did affect my shots taken in bright sun, but a friend then marked the chip with a black marker and it has worked perfectly ever since. I rarely use it, but it's a good lens.
So there are choices and choices.
If you go by comments from perfection seekers or obsessive shooters of test charts, no lens is perfect. In the real world,whichever lens you select will serve you well (unless damaged and not focussing correctly) for most of whatever you shoot.
If you do a lot of close-up work, get the Micro Nikkor. For general photography, the 50/2 is your baby. Or the 50/1.8. Whichever.
Or why not both? Pre-AI/AIS Nikkors were dirt cheap for many years- in 2009-2010 I briefly considered selling out of Nikon but I couldn't get even A$50 for each 50' and so I kept them. They are more expensive to buy now, but with some hunting and astute bargaining you may be able to get both for less than the cost of a 50f/1.4 D,which I also have, but rarely use. As for my 60/2.8 Micro Nikkor D, well, now THERE'S a classic lens...!