It might be my favorite... but my reading has always been colored by perspective, and I don't have a solid way to separate it.
I first started reading steadily by 91. And at that point, Byrne's wasn't just any origin of Superman, it was the origin of the one I was reading and was strongly attached to. So it wasn't an origin tale in it's own right, it was backstory. That doesn't "read" the same way as it would if you're just comparing one origin to another, or reading them fresh as a stand-alone.
So I'd say it's a favorite, but moreso for what it became than what it was directly, if you know what I mean.