You can't do stereo with fewer than 2 speakers but even if you have 64, you're probably still doing stereo. (Or you are a movie theater.)

Generally speaking, you can probably achieve better stereo sound with the 4 speakers than with the 2, but this is not always the case. Coming from Apple, I would normally expect the Pro to have higher-end speakers and thus probably sound better.

But I could be wrong, since Actual Audio Professionals don't use the onboard speakers for anything serious.

Also: I'm really surprised there are enough TouchBar lovers to justify its continued existence.