Debate...

Ok, so this is the debate I am having... not that I am going to get either one of these any time soon, but if I were, which one should I get??
Or should I just change my blackberry and get an iphone?? decisions, decisions.
Really I just want the apps. And the ability to read books on the go, and since I already spend too much on books in the store, I think it would be much easier if I carried one of these things in my purse rather than the three or four books I carry in there now and then I could download the book immediately. Anyways... you tell me which do you think is the better investment?
xoxo,
josslynn nicole