First of all, what do you want to write? Is it thick or thin?
Compare 0.38 and 0.5, which is closer to the effect you want ~
Secondly, from the perspective of practicing calligraphy, practicing rough will exercise basic skills more. When writing rough strokes, fine strokes are easier to use (of course, this is a common situation, and there are individual differences that cannot be generalized)
Finally, we can consider the degree of application, whether it is 0.38 or 0.5, and we can also consider it from this aspect.