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Is the effect small or large?

Reindal and colleagues (1) studied age for onset of independent walking. For children diagnosed with autism spectrum disorder, the mean age (standard deviation) was 14.74 (4.28) months, and for children without autism spectrum disorder, it was 13.76 (2.88) months. The difference was therefore 14.74–13.76 = 0.98 months. This is the effect size measured on the original scale, also called unstandardised effect size. In addition, the authors report a standardised effect size as this difference divided by the standard deviation in the comparison group, that is, 0.98/2.88 = 0.34 (see figure 1). Which of these measures is most relevant?