Both sets of examples are good and sound very natural. It is generally more common to see and hear the plural form, not that it is better. I think the plural is used more frequently in general statements.
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teacherJapanOne thing good about reading is that you can talk about (1)a book/books you've read.
teacherJapanOne thing good about reading is that you can talk about (1)a book/books you've read.See this: