Your questions says is either i choose book or computer.
Now let look at the definition of the two concept(book and computer)

What are books? A book is a series of pages that are assembled for easy portability and reading, as well as the composition contained in it.

What is a computer? : A computer is a machine that are mostly electronic which is able to take information, and process it to make new information.

      How are the two related?

The two contain information written on it by someone,for this to be in use they must be someone that will fill in information that people will be able read and understand.
This two always contain information either relevant or non relevant.

The difference!!
There are significantly much difference between this two.
Let solve!!

Long lasting:

A book is written with ink and it can exceed any amount of page, it is visible at any time if not damage by fire or erased ink.
The computer can store a load of information for years to come and will intact if not damage or attack with malicious error.
But the computer is at safer hand than the book because it can be stored on diffrent device and even blockchain storage system has killed the book already.
My Vote: (computer)

Prone to attack:

So the two are prone to attack at anytime...
The book can get torn at anytime and it wont be an easy task to be able to retrieve expecially when it is written in just one copy
The computer can also get damage but before its been used it is always advisable to the user to make back up. So it is easy to retrieve.
Backup can be availabe for computer but may not be available for books
My vote:( computer)

Electronic vs non electronic:

Book are not view with use of electronic. They can be easily view at anytime whether in the dark or lightness.
Computer can only be use whe there is electricity, even though it has a long lasting battery, it will still need electric to be available for charging.
My vote: (Book)

#Deep Information soughting:
The book can be use to sought information but it can go deep than that which is written in the book.
The computer can be use to sought more and more information deeper because it is a device that collect information from diffrent source around the globe.
My vote: (computer)

Conclusively: based on my little observation and voting i would rather choose computer over book because i will surely get more information on computer than the information will give me.

Hope i answered your question.
Enjoy your reading!!