Fractional measurements are better than decimal measurements because they allow greater representation of precision without having to do any +/- bullshit.

For instance, if your measurements are precision to half a meter, in decimal you either have to record it to the nearest meter, imply your measurement is five times more precise than it is, or do something like “1.5 meters +/- 0.25 meters”.

Wheras fractional measurements allow you to just put the precision as the denominator. Just don’t reduce your fractions.