Torn
If given a choice i would definitely answer physical book in a heart beat. The feeling of having a physical book is incomparable to using your Kindle or Tablet. The smell, as you turn the pages. You can see how far long you have read and how many chapters are left. BUT i do like the electronic version too specially if i'm going out. You can't really bring like, 10 books if you're travelling right? And as for me, not all the books that i like are readily available in my country so i have to buy the electronic version. (Yeah sucks right?) The downside on electronic ones is that, if your electronic devices' battery gets low/empty and it will damage your eyes more compared to reading a physical one (though it could also damaged your eyes too not just as much) and excess usage of electronic devices has its side effects (brain and such)
Sooo
i'm torn. There are pros and cons but if i need to choose only one i would always answer the physical book.
:)