do you prefer to read E - books or printed books ?

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well it is kind of hard to tell , actually it depends on?what to be read when it comes to?my choosing between an E book or a printed book .

1st?as for books that are used to kill time?, such as online detective fictions or love stories , I’d do the reading on an e book which is?time efficient?and convenient , I mean portable like in my personal computer?or smartphone , for example ,....

2nd?however in terms of ancient classics?or foreign masterworks , reading a printed book is undoubtedly a great idea since there is a sense of?artistic beauty to be felt , and the smell of ink of a printed book makes me feel way comfortable than?that of an electronic device?,....