When it first opened, there was a lot of speculation over which was better PMBO or Nemesis. I knew a few people other than myself who rode them both (original PMBO and Nemesis) those first two seasons.
To be honest, it was very split as to which was the better out of the two. However, after the changes were made, the choice was very clear for everyone.
I was certainly only just in the Nemesis camp in 1995, but after riding PMBO again after the modifications, it was clear which was the winner
As Marc said, before the reprofile, PMBO was scary and fast, until Bizarro, I don't think I experienced a drop that made me go quite so "WHOOOOOOA".