mm (10^-3) is most common used it varies on what your measuring eg km wont measure a 50cent coin
and pm wont measure a football field
Basic Metric system
10^12 - Tera
10^9 - Giga
10^6 - Mega
10^3 - Kilo
10 - Unit
10^-1 - deci
10^-2 - centi
10^-3 - milli
10^-6 - micro
10^-9 - nano
10^-12 - pico
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2.5cm is the most precise measurement of the two measurements.
Its 12.000
What determines how precise a measurement is
Since it was based on the length of a forearm, it wasn't precise enough or standardized.
It is precise if it is repeatable.