It's better because of network effects. More than 90 percent of the world uses it. They benefit from a consistent lexicon when communicating about measurements.

Nobody will ever convince anyone else that a centimeter is better or worse than an inch. Or a pound vs. a kilogram. It's a ridiculous discussion to have.

When the primary benefit of a choice is consistency, the outliers will always be able to argue that their system works for themselves. Which, unfortunately, misses the point.