Final Fantasy 7 - I like the turn-based battle, I like the original story and the pacing. The only thing better with the remake is the graphics.
Dragon Quest 3 - I like how the world is "smaller" in the OG. I also prefer the 16-bit pixelart more than the HD-2D style. Also the auto-battle breaks the gameplay in the remake.
Super Mario Bros 3 - the original NES art style looks unique, I prefer it over the newer graphics in Super Mario All Star.