My younger brother and I owned an SNES growing up (after having had the NES before it as well). One of his friends was a Genesis fanboy, bragging about the speed of Sonic, etc. And, my best friend's family primarily bought Sega consoles. I'm talking every expansion to the Genesis from that original bulky Sega CD deck to the 32X. But, we never got into fist fights with anyone over it though. My brother and I were perfectly content with Super Mario World, A Link to the Past, Final Fantasy II & III, Top Gear, etc. The commercial I remember thinking was total BS back then was the Blast Processing one showing Sonic playing on a TV strapped to a dragster while Mario Kart was playing on the back of a beat up milk truck or whatever that was.