Always confused me why the SNES was so paltry with its speed when the competitor TurboGrafx-16 usually ran at 7MHz, and also had a 6502-family CPU that required similar memory timing. But the TurboGrafx flopped (in the west) and the SNES was a hit world-wide, so I guess they did something right.
Still have all my old consoles including the Turbo Graphics 16 and SNES. It was all about the software. Mind you this was during a time when games were $50 each which today is something like $100. If you wanted to sample a game you hoped a friend had it so you could borrow or the local video store had it to rent. If not it was a crap shoot and game review magazines were a staple.
TG16 had nothing to compete. I only remember the popular side-scrollers like Bonks Adventure or Splatter House. The rest were "weird" games no one was interested in. We had about 7 or 8 games before we gave up on it. I had I think one other friend who had one who also gave up on it with just a few titles.
There was a time around the turn of the century when some friends and I shared some studio space, wherein we had a long-lasting (years!) high-score competition for that game. (Scores had to be witnessed, and were then written on the wall by the door.)
I still want to play all of the Splatter House titles, though. I didn't find out about those until I was older, but I've watched plenty of walkthroughs of the various iterations, and it looks like the perfect amount of strategy, gore, and need for proper timing to master.
I'd say TurboGrafx's biggest advantage was that they had a full handheld version of the system available very early on. The Turbo Express crushed the Game Gear and Lynx in terms of power. (The Game Boy still beat all its more-powerful competitors because of its far lower battery consumption)
The gameboy won because it was half the cost of any of it's competitors. while being more than half as good.