To me the difference between Muffet and Geno is deeply rooted in their psychology. Muffet sees things in a very zero-sum way, is extremely loss-averse, and I think is very consciously aware of expectations. So the perception that her team is "supposed to win" make it feel like there is nothing to gain and everything to lose, and that, obviously, is less fun.
I actually don't think Geno cares about winning, per se, as crazy as this will sound. And he definitely doesn't care about what other people think. I think he cares about execution, performance, and pursuit of perfection - winning will happen when those things are in place. But it's those things, not winning, that is what motivates him. And it's why when he loses to a team that out-executes, he credits the team and is remarkably sanguine. In his mind, his players didn't do what they were supposed to do - of course they'll lose from time to time when they don't get the execution right. But the not getting it right is the problem, not the losing. By the time the clock ticks zero, he probably sees the outcome as just, in a weird kind of way.
This is why I am a huge Coach Geno fan and something of a Coach Muffet hater - on court, Geno cares about execution, while Muffet cares about winning, and I find it grating and exhausting. In that respect, Geno is a lot like Tara, and Muffet a lot like Mulkey - neither Geno nor Tara wave their hands around like air traffic controllers or toss their clothes on the court like adult dancers in Vegas. The easiest way you can tell if a coach cares more about winning or execution is how they react to questionable calls. Execution-focused coaches focus on executing the next play - they can't control every call, but they can control every subsequent play. Winning-focused coaches focus on arguing with the refs, because they want to win that argument, along with everything else.
Off the court, however, I respect Muffet a ton. And off the court, Geno is a bit too brash for my taste. But I really can't stand Muffet during the only 40 minutes I actually care about - the basketball.