排名很重要。建议你专门看一些。请参考下面的网站和文章：
Graduate business programs Rankings report in the United States (as well as other places on the earth) appear to be an influential factor in the decisions of a variety of interested parties, including the number of applicants, alumni, salary levels, employers, and business school and university administrations.
There are two major sources of such rankings in the United States, Business Week and U.S. News and World Report. The schools within the report are re-listed each year so in this way, they can attract the attention of the specific schools (which may up and down in their list dramatically) and more potential readers (who may use the ranking to filter their schools).
Rumors about the editor of ranking report take bribe from specific schools are appearing again and again, and actually, you can not expect a commercial report to be "academical reliable".
Suppose the those ranking report is reliable. I would like to recommend you to pay more attention on the specific cities your schools are located and the weather of the places because you will living that city or town and your experience there is not only study, but to live a rich life.
参考资料：http://masterofbusinessschool.blogspot.com/