Going to Beijing for java training is the right decision. Because the headquarters of large it training centers in China are concentrated in Beijing, you have many choices, and not only those you mentioned, but also those you mentioned are not among them.

Different brands have different characteristics. You need to consider your own situation and conditions comprehensively. You can't simply judge the level and choose the one that suits you best, so. Only you can really investigate and shop around. There will be an answer.