Metric is scientific because it's based on the speed of light and on quantum theory and vibrations of atoms and shit like that that nobody understands but is irrelevant to its everyday usage.
The superiority of metric for everyday usage is it's all base 10 conversions, you have SI standard prefixes for most units that just scale the number by powers of 10. Well, except for weight, which keeps some older names for the prefixes, but it's still all based on powers of 10. 1 gram is the base weight unit, 1 kilogram is 1000 times that, 1 ton is 1000 kilograms. Below 1 gram you have standard prefixes like milli, micro, nano, and so on.
Distances: meter is the base, then you have standard prefixes kilo, centi, deci, milli, micro, nano.
There's no non-base-10 conversions you have to do for the same measurement, like in imperial you have weird conversions I don't remember for inches to feet to yards to miles. Same for gallons, pints, quarts. Or ounces, pounds. Or the fractional measurements for inches that's standard for bolts, pipes and pipe threads. Adding two metric measurements together is easy, two fractional inch measurements together is adding two fractions with different denominators, requires multiplying or dividing and several steps.