These are two genres of music and hence should not be subjected to comparision, and if they are, then shouldn't yield any outcome. It depends upon your taste bud. Rock fans might make fun of Hip hop culture and Hip Hop fans will then make fun of Long Hair era. To me, anything done with a good amount of talent and dedication will result in excellence. Rock has been around for a while. The new rock bands are most of the time heavily inspired by Led Zepp, Pink Floyd et all. You can even make a point that it is a "perfected" genre of music and lots of studies have gone into this. Hip-hop, contrary to popular music also has been around for a while (late 60s to early 70's). In recent years the genre has gone main stream but underground hip-hop music was always present. Sugar-hill Gang, Russel Simmon, Run DMC and Hip-hop Grandfather Afrika Bambaata had already started the craze in the streets of LA and NYC. For me, the only derivation of Rock that I listen to now, is Alternate music. Hip hop is fresh and hard core hip-hoppers like Naz, 2pac, (and even few other street/underground hip hoppers of Bronx, Brooklyn) are fun to give ears to.