Is this claim arguable? I'd rather read from my computer then to read from a book.

Yes

Explanation:

As long as you have a supportive opinon to go with it, it's a claim because it's your opinon as well

Answer: Yes, using a computer to read instead of a book is very easy. You would be able to change the font to your liking, it would be easier on your eyes if you had trouble reading small letters. If you read from a book you would not be able to adjust anything to your liking.