Fkin poll is RIGGED!! RIGGED!!!!
J/k...well only sorta. Me personally, would choose Saturn as the better of the two WRT the library I'd play today. However, in terms of which system had the most impact on driving the industry forward? That is easily the N64. In fact the N64 isn't too far behind the PlayStation 1 in that regard.
The Saturn was mostly reflective of a system burdened as a relic of the past, trying to somehow compete with what would become the future, despite lacking a lot of the tools to do so. SEGA got too caught up in trying to directly compete with Sony, when they should've learned from Nintendo and diversified their market approach while synergizing their core strengths. But that's hard to do when you have two branches looking to slit each other's throats over pettiness.
The N64 gave us monumental gamechangers like Super Mario 64, Ocarina of Time, native 4-player couch multiplayer, GoldenEye 007 and more. Compared to that, there's very little the Saturn provided both in a software or feature sense that wasn't matched or bettered by the PS1. VF2? Great fighter. So is Tekken 2 and I'd argue Tekken 3 is better than the both of them. SEGA World Touring Championship? Interesting, but then Gran Turismo showed up and mopped it out of relevancy. Clockwork Knight? Fun game, but Crash Bandicoot did 2.5D better and with more style. Hi-Octane? OK, but then Wipeout showed up and redefined futuristic racers forever. I could go on and on.
The amount of 3P who gravitated towards PS1 (both naturally and in deals SIE pursued with them) was just overwhelming for SEGA, but it was SEGA's choice to try competing with that directly despite spreading themselves way too thin and even kneecapping the Saturn to some extent so as not to encroach on their arcade market. I think SEGA should have either truly focused everything onto Saturn from the get-go (including it's design, meaning developing something tuned for 3D gaming specifically), or synergized their Saturn platform with their arcade business in more optimal ways. For example, games like Daytona USA, VF2 etc. needed to target the Titan arcade board chiefly so that Saturn ports could take less time and leave room for tons of extra home-exclusive content, THEN port those Saturn versions back up to the Model 2/Model 3 systems with better graphics & the added content plus maybe additional content.
Had they done either, they would have done much better that gen. Instead of the 9 million or so they sold, they probably could've gotten closer to 40-50 million (completely all-in, redesigned-for-3D Saturn, same 1994 launch frame) or at least 20-25 million (same Saturn we got but with much better pipeline optimization & synergy between home & arcade operations). Both of which are obviously better than what they actually wound up doing, and would've been enough to secure a space for them to keep making console hardware with Dreamcast and beyond.
Because rounding back a second, that is in big part what ultimately hurt the Saturn everywhere outside of Japan: it was just an inferior PlayStation to the vast majority of people, and the library of localized games bore that out to mostly being true. It was perceived as an off-brand PlayStation, whereas the N64 actually offered a good number of things the PS1 couldn't, hence why it competed pretty well with Sony in Western markets. The Saturn's perception as an "off-brand PlayStation" is basically the exact problem Xbox consoles have today, which is why Xbox Series is seeing a similar trajectory of market irrelevance. People don't need two PlayStations, especially when one's a copycat. The legit one is more than enough.
That said, nowadays with both systems libraries fully available and (mostly) playable to a global audience thanks to fan translations...I personally can't prefer the N64 over the Saturn. Many of N64's best games have since been iterated on and perfected with sequels on future Nintendo consoles, so in a way if you want to play the best versions of those games or the systems & ideas they represented...just play their Gamecube, Wii, Wii U or Switch sequels instead. Like how many people are really checking out the N64 Smash Bros. when Melee exists and wrecks it on every conceivable level? Super Mario 64 might be evergreen for its reverence and speedrunners, but if you're a casual or mainstream gamer, or even just a typical core enthusiast looking for a great Mario platformer, I don't see why you'd "put up" with a lot of SM64's inconveniences when games like the Mario Galaxy series, 3D World or Odyssey are just as whimsical, more polished, and have much better QOL features.
With the Saturn, that's not as common a scenario you run into. There really haven't been a lot of rail shooters with the type of atmosphere or elaboration of ideas that games like Panzer Dragoon Zwei presented, as that genre fell out of fashion during the 6th gen and some of the only few afterwards were horror-themed games (the Wii Resident Evil titles, House of the Dead, etc.). The Shining Force series peaked on Saturn and there have not been new entries quite like SF3 or Holy Ark since the 5th generation. Strategy RPGs have definitely persisted since then, but very few have specifically carried on the spirit or mentality of those Camelot Shining Force games. And there's practically been no modern day equivalent of the Dragon Force games beyond the 5th gen, either.
I'm not saying the N64 doesn't have games like that which still make it worth playing preferably in the modern context. Iggy's Wrecking Balls is seriously slept on and there hasn't been much of a game like it beyond that gen, to my knowledge. Space Station Silicon Valley is still quite unique for what it is, as is something like Hybrid Heaven, Mischief Makers or Sin & Punishment (which did get a sequel, but like decades later). There's just way less of them than on Saturn, and despite it having so many popular games that have seen been iterated on towards making the 5th gen installments redundant, the PS1 has more "unique" offerings specific to its era with little iteration beyond the gen than both Saturn AND N64, probably combined. Like I'll never skip a chance to tell folks to play Planet Laika now that it's finally in English (seriously, play it already if you haven't, especially if you like weird Enix games with themes of space dementia, mental illness, multiple personalities, transcendence and touches of horror in a retro-inspired semi-psychedelic sci-fi post-modernist atmosphere not that much dissimilar of '90s anime like Evangelion or Betterman).
So yeah, that's my take on the two systems. Love them both, though, for their unique reasons. As should anyone.