It may be similar for all the chip-tunes.
But you can not compare a NES sound quality to an Amiga !
The NES can't produce digital sound for example, all the tune are based on a chipset which produce pre-recorded sound (a bit like midi sound). I never heard digits on NES, but maybe I'm wrong.
All the Amiga modules are used to be done with 4 digital channels, who are playing samples.