Genesis Soundchip=Rock Music?

[Gors]

by better sound output you might mean sound frequency. Since YM 2612 is a synthetizer, it is able to produce waveforms with 44khz natively. The SNES on other hand, can play 44khz samples - but in order to save memory, they're usually saved in 38khz or something like that. Some games like Earthbound dared to include 44khz samples in some music (it's a sample heavy game after all).

But otherwise the synthetizer will never achieve a sound similar to the real world instrument - all you'll get is a good enough imitation.