two souls, that are so similar it's painful to watch

If you are looking for basic information on either Naruto or Sasuke or you'd like to take a look at the articles about the series itself or the creator, the sections filled under "A Shinobi's Heart" are the right place for you to go. One could say it serves as some sort of introduction, and only holds the most important facts and figures about the two ninjas.
"Reading your mind" however, contains only indepth information, essays and interpretation about both the characters and also Team Seven, since Kakashi & Sakura had influenced both of their lives immensly. It takes a much closer and deeper look at their personalities, reasonings and actions. It might help understand one or the other better. :D
Last but not least, Bound Together focuses only on their relationship - it consists of 5 chapters that try to give you a bit of a better understanding for the two. I recommend starting with the very first chapter entitled Being Different and if, reading one after one. It makes more sense that way (or so it should).

On a sidenote, you can also directly access the indepth sections via the shortcuts above - just next to the quick guide are 3 symbols you are free to use as well.

What I'd also like to clearly state is that one does need to have some background knowledge about the series and the characters- which means, without having seen most parts of the series, I am pretty sure one will not understand most of the context written here, especially as far as the interpretation goes. This should be a given though- and if you're not sure about one or the other incident mentioned somewhere, just proceed to the overview categories.