Here some further proofs about the N64 graphical superiority.
From IGN review:
VIGILANTE 8: 2nd OFFENCE
Graphics
Luxoflux, V8's designers, attempted to make this second game more uniform across all platforms, which is a very good thing considering that this year the benchmark wasn't N64 performance but rather the more powerful Dreamcast. That means that Luxoflux overextended themselves on the N64 while aiming for Dreamcast quality, and the system seemed to be able to catch up with their ambitions. V8 2nd on N64 is so sharp and fast that it can stand side-by-side with the Dreamcast game. While the original looked like an improved PS game, the new game features lighting effects on cars, vast draw distances, and complex level architecture. Everything explodes with magnificence, just like last time, only this year the framerate has been locked down better. Effects are pushed to the maximum, with gentle waves lapping the shores of beaches, sharks and ghosts prowling their respective turfs, rough seas tossing your skiboat vehicle, lights with sharp lens flares (the sun has its own heliosphere effect), and working gondolas, trucks, trains, boats, ect. One weapon sends ripples through the ground of the entire arena surface, like somebody had picked up the floor and shook it like a carpet. The tearing problems of the PlayStation game, which left a jagged impressionistic mess when up close on an object, don't factor in to this game, although the lack of texture space can be seen even though the game can be bumped up to an incredible ultra-high resolution setting (which is developer-English for high-res/640x480). Framerate is fairly solid throughout the single player game (there's a drop when you up the resolution, but the difference can be quickly overlooked once in battle).
GRAPHICS
Sharp and full of effects, this game rivals its Dreamcast counterpart, not that measly PlayStation.
...and about the PlayStation version:
The game still looks nice once you settle into it, but the flaws are amplified this year, and (compared to other systems) the PS version suffers the worst hit of all editions of the game.
An amazing effort on the PlayStation, but not much better than last year, and not at all favorable compared to other systems.
SPIDER-MAN
This superhero has never looked better, and the N64 version meets and exceeds its PSX predecessor on all fronts.
SHADOW MAN
I played both the Nintendo and PlayStation versions one after another while I was at home and they simply don't compare in graphics, sound, gameplay, control, you name it. First, the PlayStation version was so dark on my TV that I had to crank the brightness to the maximum. That didn't work at all, so I closed the shutters and turned off all the lights reduce the glare, but that didn't work either. That's when I discovered that the N64 version had something the PS version didn't have, an in-game brightness meter in the option menu.
ROADSTERS
The N64 version of this game looks better. MUCH better.
IGN on GAUNTLET LEGENDS PS1:
If you have all of the systems, than you should get the Nintendo 64 version. If not get this one, you'll enjoy it, especially with a friend.
RESIDENT EVIL 2
Gamespot:
The graphics are even more of a wonder. If you use the N64 expansion pak, the visuals are bumped into hi-res mode, making them look even better than those in the PlayStation version. But even without the pak, they're still very impressive. Sometimes, the backgrounds look washed out while the characters remain brightly hued, making them stand out strangely, but it's a very rare occasion when that happens. The game's frame rate also slows down a bit when numerous monsters are onscreen at once, but not enough to affect gameplay. And though the computer-generated FMV sequences look grainy in comparison with the PlayStation version, they still look fantastic considering the cart format.
IGN:
A beautiful PlayStation game made to look even better with high-resolution graphics and smoothed out backgrounds. FMV is still a bit grainy, as are some in-game textures
As I often say, play both version watching them one near to the other on CRT, will immediatly let understand how much the N64 version is visually better. There's no even something to talk about, it's day and night noticeable better.
But it's pretty obvious, try to image the same game on 640x480 and on the other side at half of the res.
But PS1 fanboys, as usual, tend to focus on less important details or crap quality YouTube comparation videos (what's the sense to compare at the same resolution a game that runs on double resolution?).
Gamespot on ALL-STAR BASEBALL 2000
If you're familiar with the All Star series then you already know about the hi-res graphics that give the game its amazingly realistic look; for those who aren't, let me explain. Put simply, All Star Baseball 2000 is far and away the most visually impressive baseball game ever. The animations of the players running, walking up to the plate, diving, and everything else look so incredibly lifelike it's ridiculous. The game has an overall crisp look that, combined with unbelievably smooth polygonal player models, makes the game look more like a CG intro than an actual playable game.
I say guys, play this game on a good CRT for 640x480 res, and after the intro you completely forgot PS1 graphics.
Gamespot on ALL-STAR BASEBALL 2001
Enhancing the gameplay, All Star Baseball 2001's visuals are crisp, clear, colorful, and full of depth. The polygon count for stadiums is high, allowing for advertising banners, scoreboards, and even the occasional diamond-vision screen. Furthermore, player models are realistically dimensioned and styled, animating in ways one would usually reserve for broadcast television. Since sky and outside visuals are made up of flat background images, there are times when the illusion of a 3D environment is broken, but compared with the PlayStation's offerings, this game's a masterwork.
Gamespot on ALL-STAR BASEBALL 99
Visually, All Star Baseball is a masterpiece. It looks a bit like Quarterback Club on the N64, only smoother. You can see the players' faces, the wrinkles in their jerseys, and multiple shadows from the stadium's various light sources. It's uncanny how much the stadiums in the game look like their real-life counterparts. The signs hanging around the parks, the jumbotrons, and even the scenery visible over the walls of the park are accurate. Ultimately, it's the player animations that give the game its amazing look. There are over 100 different batting stances and over 600 unique motions, including catcher collisions, wall catches, sliding catches, running throws, the jump-pivot throw at second base, player injuries, dives, kneeling throws, and more than 30 catch types. All of the action can be seen from several different user-specified camera positions, although at some points in the game the camera angle will change to a fixed TV-camera-style position for dramatic effect. The sound and music are quite good. Most notable is the two-man play-by-play announcing by John Sterling and Michael Kay. They spout off over 1000 different calls and comments. Although it can be a little dry, the announcing really gives the game some authenticity.
Gamespot on FIFA 99
Of course, the 64-bit version of FIFA outshines the PlayStation version in the graphics department. The textures for the field and stadiums come close to photo quality, and the player shadow effects look convincingly real. There's never any polygon flicker or breakup during a game.
Gamespot on FIFA 98
EA's latest version of FIFA looks fantastic on the N64, taking advantage of the machine's powerful antialiasing hardware to create some of the most solid polygonal athletes in sports gaming.
Anyone still doubts?