Metric is easier for children to learn.
Imperial is generally a finer and therefore more accurate measurement.
If you're not completely dim, you will have no trouble learning the Imperial system
USE METRIC SYSTEM SO IT'S EASY TO CALCULATE MEASUREMENTS; UNITED STATES; USE IMPERIAL SYSTEM SO STUDENTS HAVE TO LEARN A BUNCH OF CRAP WHICH MAKES NO SENSE, AND ALSO MAKE IT HARD TO CALCULATE MEASUREMENTS; UNITED STATES