In all honesty, Western, without a doubt. It's just that you have to look beyond the typical Britney Spears image of Western music. There is so much variety and creativity in more alternative and indie music industries.
Beyond a handful of amazing Japanese artists (Ayumi Hamasaki, Utada Hikaru, Namie Amuro, Hidemi Uematsu, alan, Ai Otsuka), not to mention Sa Dingding
, the mainstream Asian music industry is just as bland and over-processed as Western mainstream pop.
Besides, most Asian artists site Western artists as their major influences and 95% of the music industry is based upon Western sounds and instrumentation.
EDIT: Ultimately I do agree that music is unbounded by geography or race and every part of the world has something musically inspiring.