which is beter and why imperial(inches etc) /Metric?

i would say metric becuase it what i know and have used my entire life it all makes sense and is mathematicaly simpler.
our number system is based on the number 10 (1 2 3 .....9 10 11)
why should the measurment system be different?

1mm
.1cm
.01 dm
.001m etc.



and who still uses imperial system besides the usa?