I would strongly recomment you not to accept any of these offers, but better check some other schools , for example Cranfield in UK.
Not only Japan is a specific country, but even MBA here is quite different from what many people have in mind.
Both schools are famous in Japan, but if you intend to get a good job here, you must spend a lot of time learning Japanese.
You will never be treated same as Japanese, for years, and especially in job placement. The only chance to get a luck is working for an international company, but they also prefer local Japanese people with international experience, or International people with local experience in business (you will not gain it during MBA)
I have been living in Japan for 11 years already, also I did a research and then a Masters course at one of famous universities. I never looked for a job as a started a company here, but all my classmates are all gone back to their countries, except several people. One Spanish guy got a good job offer, but it was from his friends farther, and company head office is in Spain. The other Russian guy is now wokring in consultancy, but he is unhappy with salary and working hours and every day commuting to/from Tokyo (1 hour one way)
Japanese MBA will never be international. This will be useless .