It's probably best to say that both pbooks and ebooks have advantages. The 'better one' often depends upon what the reader thinks is important and sometimes depends upon what is being read.

At the moment, I prefer ebooks for novels and certain non-fiction books. eInk is almost as good as paper, battery life is excellent, and everything goes smoothly because everything is read linearly. For most information books though, dead trees still win out. Random access is a lot easier at the moment, a table of contents or good index is more reliable than a keyword search, and battery life sucks on the ereaders that are good for fixed format or colour documents.

Of course other people will draw the line in other places. There are plenty of people who still read DTB novels and plenty of people who read information texts on tablets.