If Fahrenheit is better than Celsius because the units are smaller, doesn't that mean that the kilometre is better than the mile because it has smaller units?

It is all subjective. You like what you grew up with because it is familiar, not because it is better. You know by rote memorisation how much 100 feet is and what 75F feels like, the same way I know by rote memorisation how much 50 meters is and what 25C feels like.