Well this is coming as a really late reply, but hope this answer will be able to help other applicants suffering the same dilemma.
I am a student stuyding at ESCP currently so i think i am well equipped to answer the questions:
Well both ESCP and ESSEC are excellent schools and have a excellent reputation in France as 2 of the 3 "Haut ecoles" (HEC being the 3rd one). Their MiM program is really excellent in both schools and they rank really high for it. ( It varies year by year but they are mostly in the top 7)
Well both schools are very similar with respect to curriculum and teachings, but the advantages of each would be:
ESCP would give you access a strong alumni network in France and UK, 5 campuses spread over 5 major countries, Central location in Paris which gives you access to a lot of local company events, a large scholarship fund- it really offers a lot more scholarships compared to ESSEC and a very European centric education. It is a good choice if you plan to settle in Europe for the near future.
ESSEC on the other hand has really good exchange programs, a large campus, a growing network & campus in Asia, good apprenticeship contracts & a more global approach to studies. You can do one year at the Singapore campus and the rest in France. So that is really interesting when one is interested in the Asian markets. (Which is a really good thing as the world is moving towards the east, and the asian markets are defining the future)
There are ofcourse many other differences, but these are a few i can name from the top of my head.
I got chosen for both ESCP and ESSEC but chose ESCP mainly because they offered me a good scholarship.
Hope the answer helped.
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