Well, kpop is better, cos a lot of info can be access through internet which the video I post state that importance too. I know kpop idol more than Jpop. Jpop the market is close. Cos the jartist there can feed themselves pretty well and don't need to step out of country. Also a lot of info cannot be found easily on the web. Kpop idol alway cross country to performance, and feel more closer. Oversea fan can source their idol info through the website. SME send their own best idol and artist to US to perform, cos their music video in youtube is very well received. About 40 artist is being send to US for concert and sold out. Some more non-korea national in kpop are getting recognised. Like Nickhum(thai) in 2pm, Victoria Song Qian(ROC) and Amber(Hong Kong) in f(x), Jia(ROC) and Fei(ROC) in Miss A, Lim(hong kong) in Wondergirls. f(x)Victoria is now feature in two popular reality variety, KBS Invincible Youth and MBC We Got Married.I know a school send some singapore student to try their luck in korea agency audition. Now MBC are holding international audition for idols through youtube.
On other hand, Jpop dun have much info beside playing and singing. Jpop is more creative in music sense, but don't seem to care about international scene or at least Asia scene.