If it's a 'collector' book, giant. If it's a 'read repeatedly & dog-ear' book, then many short books.
Shibboleth challenge question of the literate underground:
"Would you rather buy many short books, or one giant book?" 
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I would rather be attacked by 100 1-inch books. [Takes martini from the bar and walks away.]
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Many short on a wide variety of subjects.
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More serials, please
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