这两个句子同样表对比,为什么一个用while/whereas,另一个用in contrast,两者之间有什么不同?

这两个句子同样表对比,为什么一个用while/whereas,另一个用in contrast,两者之间有什么不同?
in many cultures,boys tend to be portrayed as clever,brave,while/whereas girls are depicted as kind,dependent.
men generally prefer shopping with their families; in contrast women enjoy shopping with friends.

while/wtereas强调前后两者有不同和差别,而in/by contrast强调前后两者正好相反,或对比鲜明.eg.
Motion is absolute while staglation is relative.运动是绝对的,而静止是相对的.
Their old house had been large and spacious,in/by contrast the new London flat seemed cramped and dard.他们的老房子又大又宽,相比之下,伦敦的那套新公寓又窄又暗.