Who do japanese better like better chinese or korean?

Question:

if they hate both of them then who do they hate more?

Answer:

Hard to answer, it will depend on the geopolitical situation at the time.

You see most japanese here would disagree, which is probably true. However intelligent right wingers and Yakuza dominate Japanese politics and society, not people here on YA, and those in power, in my opinion, hate China more as China is more than just an economic threat like Korea. They don't like to live under the shadow of China, it threatens their inferiority complex.