Both are units of measure. Neither is more 'precise'. The precision is to do with the accuracy of the measurement taken and not by the units used.
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A decimetre would be more precise - it's one tenth of a metre.
Centimetres.
No, a decimetre is one tenth of a metre.
decimetre, 1/10 or 0.1 of a meter
Who knows? But one tenth of a metre (or meter) is a decimetre.