What game released before the turn of the millennium do you think looks the best?
(No 21st century enhancements such as HD remasters or post-1999 mods allowed)
PC or Console. PC at the time, highest possible consumer grade... Not that most of us could afford it though.
Also, on the console, I think it depends on whether you ware looking at 2D sprite or 3D.
2D wise, with the games I played FF6 (I know I am hugely biased) or Secret of Mana. Probably doesn't count.
3D. I think I agree with Coktoe. I loved Soul Calibur on my Dreamcast. Cool thing about the Dreamcast is you can buy a relatively cheap cable to output to HDMI. Get something like an OSSC and you can really upscale the Dreamcast with surprising clarity.