- scrolling quality (I appreciated C64 for its 50/60fps scrollings, but in my experience, emulators screw that)
- graphics quality (usually, once on digital screen, all the NTSC/PAL artefacts disappears, making the graphics quite different from an original C64)
On an LCD screen however, there's a whole new set of artefacts appear .. mostly vertical lines. There's ways to address this, some are more involved [0] than others [1]
[0] https://www.videogameperfection.com/2016/08/17/lumafix-64-re...
[1] http://sta.c64.org/cbmsvideo.html
- scrolling quality (I appreciated C64 for its 50/60fps scrollings, but in my experience, emulators screw that)
- graphics quality (usually, once on digital screen, all the NTSC/PAL artefacts disappears, making the graphics quite different from an original C64)