Depends on what you intend to do post-MBA.
For example, if you are interested in working at a CPG in brand/marketing management, you don't have to aim for Wharton, Kellogg, or Duke per say.
CPG's recruit extensively from many bschools. When I went to one of those Superdays at CPG corporate HQ for summer internship few months ago, there were students from Wharton, HBS, CBS, NYU, Cornell, Tuck, Indiana, Wisconsin, Emory, Kellogg, etc.
If you are looking for marketing education, rather than post-MBA job, most b-schools teach the same fundamentals. But different schools have different electives and star professors. That's where schools like Kellogg, Wharton and Duke differentiate themselves from the rest.
GMAT Club Premium Membership - big benefits and savings