I think numbers 2, 3, 5, 7, 10, 12, 13, 18-20 were all top-notch (on Word on tha Streets). The song that probably gets the most play for me are either #2 or #3. Hell, #5 is bangin' too. If you take this album and compare it to their first album, it has improved ten-fold. Kutt's CD is dope, don't get me wrong. Now, if the beats were all "blah" on Word on tha Streets, then yeah, it might not have been as good for me. I favor lyrical content, but if the beat is shitty, I can never make it work. S&S are certainly not the most original cats, but this album was an awesome improvement.
For me.....
Word on tha Streets> Killer> Feature Presentation> Vitiligo (Haven't heard the other two. If Killer had less "skippable" tracks, it would be my top choice.)