So, I was a SEGA girl, grew up on the Genesis and later the Dreamcast (also a Turbo Graphix 16). Never owned an NES or SNES, but I have owned almost all the Nintendo handhelds. My first Nintendo home console was the N64, and I fondly remember the first Super Smash Bros commercial on TV. Don't remember any TV ads for SEGA but I do know that my local Best Buy, at the time, had a gaming area in 1993 with a huge statue of Sonic when Sonic 2 was big. Pretty sure they were pro-SEGA.
I have seen this though... I'm sure many others know of it.