Outside that first season for the N64 (Mario 64>>>>everything, for at least a month there), I always thought the PS was the best system. I got into the Saturn in late 98 and I really love the thing -- I've probably played it more than my PS since then, but at the same time I felt I had far more to catch up on and find at that/this late date. As I've mentioned elsewhere, the fact that it's more of a 2D machine makes it more bearable today than the PS -- which is a bit of a reversal of positions from what things were like during their era.
Overall, my vote goes to the PS -- in its heyday, it was the best thing going for gaming so far as consistency and variety in the mid to late 90s. It'll be interesting to see if ANYBODY is pro-N64 over the other two.