I am an engineer and there are benefits to both. (although it is sometimes a hassle to do conversions)
The metric system is nice because everything is mostly related by decimal points (factors of ten), and prefixes can take care of very large or very small numbers (i.e. nanometers, micrometers, millimeters, meters, kilometers, etc.). There are other benefits as well, many conversion factors are often just factors of ten.
However, the english system has certain benefits because the relation between time and all other quantities is often easier, as well as helpful relations between volume, distance, etc. There is a certain benefit to having numbers that are all divisible by 1, 2, 3, 4, 6, 12, etc etc. And those relationships are often helpful.
Anyways, that is the end of my nerdy rant