PSX games have really benefited in recent years from going portable. First with the PSP where anyone using a custom firmware could fairly easily convert any PSX ISOs to run on the handheld system. Plus of course the official PSX game support for PSP from Sony, where you can buy old PSX games though the PS Store on your PS3, download them and then play them on the PS3, or load them onto a linked PSP to play on the move. And more recently on Android with the PSX emulators PSX4Driod and FPse, and of course Sony's own gaming Android phone, the Xperia Play, where they are directly porting some PSX games directly too and they run perfectly.

On a small handheld screen running PSX games really does make sense because the now blocky looking graphics on a TV look great on a smaller display, and the games run perfectly, with so many PSX games having brilliant gameplay.

Saying that, load any N64 game up on a PC emulator and you can take advantage of the system's graphics card. Unlike the Saturn or PSX, N64 games can be emulated in any resolution, and can have graphical enhancements easily added to them, so under emulation the Vaseline like full screen filtering of the real console is gone and you instead get some nice crisp higher resolution graphics with some nice smooth textures. Really adds some new life to the games. Sadly for me I think N64 games have dated badly because they had a very 90's feel to their control and gameplay. The N64 definitely hasn't aged in a cool retro way like the SNES has. For me the SNES to the real gem in the Nintendo retro history.

As for the Saturn, it wasn't good when new, and hasn't aged any better. It was bad at 3D at the time and just looks dire now. Where it did shine was 2D, and the games it saw released utilising its advanced sprite handling are still some of the best examples ever seen. For fans of 2D fighting games from legends such as SNK the Saturn has aged well, but overall for me as a gaming system it has aged the worse. Compare this with the Dreamcast and I personally still hold the Dreamcast as one of my favourite systems of all time and a true classic.