Dreamcast: Jet Set Radio
PS2: Ratchet and Clank
Xbox: Conker Live and Reloaded
Gamecube: Zelda Windwaker

As some others have done, if I had to narrow it down to just one per console, I'd probably go with:

Dreamcast: Soul Calibur
PS2: Okami
Xbox: Ninja Gaiden Black
Gamecube: F-Zero GX

Somebody remind me to take a picture of RE4 running at 480p to my BVM when I'm on vacation in late May. With good phosphor glow and solid blacks, from a CRT, RE4 looks fantastic on GC, so long as you have Component or Scart Cables. 

Project Justice on the DC. Set your screen and youtube to max size/resolution for this. Excellent footage of what 480p on a CRT looks like, when using VGA, Scart, or Component cables. 

https://youtu.be/VevZip0QHi8?t=285

I'd never actually heard of that one before; I feel like a lot of Dreamcast games with that signature colourful arcade style and high framerates have aged well:

Dreamcast is an excellent console to collect for. Lots of games have aged extremely well because they are just arcade ports of great pick-up and play games. Some people complain that the system is finicky to get working, but as long as the GDRom Drive and PSU have both been recapped/calibrated its good for 30 more years. Tons of fantastic indies for the system now that are on stamped (not burned) CDs.

https://www.thedreamcastjunkyard.co.uk/2024/01/the-complete-guide-to-commercially.htmlhttps://www.pixelheart.eu/en/categorie-produit/retro-games/?pa_plate-forme=dreamcast-us-jpn