I've worked all my life in diverse engineering and scientific related fields, and have used both systems extensively. Neither is ultimately superior in my estimation, and both have significant utility that needs to be understood and appreciated for what each can best do.
Scientifically the metric system is hands down the best thing going, and I highly recommend that everybody working in any connected capacity, learn and make use of it!
Engineering related fields, I'm a bit more ambivalent concerning metric, and though I find that it can have utilitarian value there, I also find that it tends toward more sterile designs lacking artistry and flare.
Which is to say that I think having a mind trained to interpret fractions and make use of proportional concepts aids tremendously in the "vision" of aesthetic design work. The long established practice of application of the "Golden Mean" in designing most anything that wants to have aesthetic quality, along with utilitarian functionality, as inherent components of the overall design is best done in a system that is designed around and comfortable with fractional concepts!
...... or so I think, but YMMV.