Wait.. how can you even compare the two? Sure, hip-hop originally began sampling disco records.. but it just makes you sound like you're completely ignorant of both genres.
hip-hop... without a doubt... plus hip-hop has lasted longer than disco... hip-hop has been around for 20years... disco was around for 3?
Funk, Disco, Soul, Mo-Town, R&B, and Hip-Hop are the same in the one! Music fo' the peoples! And dey all rule. Fist Raised!
I did say Hip-Hop and not shit ass rap and to further give you confusion I would put all those genres under the soul heading alone.