Punk vs. Grunge

We have talked about punk vs grunge in our youth cultures but it seems like its hard to differentiate between the two in part because musically they are very similar but also very different. I have no right to say i am the master of these music styles or that i can comprehend each culture fully, but i will say that i have listened to both styles of music exstensively and understand them more than most. Punk as I consider it is much faster, its lyrics are often much more direct in their approach, the vocal style often involves screaming, the time signature of the songs is almost always in common time. As opposed to punk, grunge is slower and to some degree heavier, depending on which grunge band your listening to, the vocal range can be impressive or less then ideal, songs are not always in common time and in my opinion the stronger of the grunge bands employed odd time signatures, lyrical content is often darker and much more ambigious. In terms of ideology both genres are similar, as are most youth cultures that involve music, true punk or true grunge says the same thing to the same people; fuck you we are going to do it our way.