For Style A, blue is good for boys and red is nice for girls. They're made of cotton, so it must be comfortable to wear them. Also, Style A is fit for playing sports and having classes.
For Style B, dark blue trousers and skirts are nicely designed. The red ties make students look energetic. But Style B is made of chemical fiber, which is less comfortable than cotton, And also, Style B is not fit for sports.
I prefer Style A. Because such school uniforms not only make us look smart but also are suitable for sports. I like the colours as well. It's suitable for boys to wear blue and white. They are a good match, They can make us feel less stressed. And red is also a good colour for girls. Red makes us feel full of energy. It can make us take action easily.