having worked extensively with metric and imperial standards in my initial course of study (engineering), the main glaring difference for me was that metric makes the math easier. units scale by multiples of ten, unit conversion is cleaner, significant digits (precision) are easier to establish. add on top of that the problem that the imperial system gets twisted by the particular application you're working with ... SAE has standards for parts and tools, machining is usually done in decimal place inches instead of fractional base 2 (half, quarter, eighth, sixteenth, thirty second, sixty fourth), carpentry works on nominal dimensions rather than actual, weight vs liquid volume (ounces) ... a real black hole of precision problems