one

 one of them引导的是并列分句。即分句+one of them分句

这里分句和one of them分句要用分号连接或者在one of them前面加连词and/but等。
one of which引导的是定语从句。即主句+one of which从句
这里主句和one of which从句直接直接可以用逗号连接(非限制性定语从句),或者根本不用逗号(限制性定语从句)。
There are many books,and one of them is mine.
=There are many books; one of them is mine.(注意这里是分号)
=There are many books, one of which is mine.

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