See, I find N64 uglier. It's aged the worst of the three consoles of that gen. Even with the RGB mod, there's still a filmy coating and it's just unappealing.
For me, it's primarily the lack of variety. Yes, it was a great MP system, but it didn't have anywhere near the variety of PS1 and was a huge step back from SNES. The lack of RPGs alone killed it for me.
Out of 90s systems, it's SNES, PS1, Genesis. In that order. I'll take Saturn over N64.