Well in this case the game is absolutely identical from the "normal" version. As said in the page, the bonus content consists of "full OST with 10 tracks, 16 wallpapers and exclusive artwork not seen in the game". So let's say if your main interestis the gameplay, you can get the normal one, instead if you like the soundtrack and want to use wallpapers, get the bonus content version.
I thought was explained clearly in the page ? or maybe I should highlight it better?