Masters in Management : LBS vs Fuqua / Kellogg / NYU Polytechnic

Hello,

I am trying to figure out:
a) if Fuqua, Kellog, and NYU Polytechnic are much better than LBS and worth turning down an offer from LBS (by not paying the Commitment Fee) and taking the risk.
b) if my chances of getting into Fuqua, Kellog, and NYU are high enough to make it worth taking the risk.

More information on my background and the specific case:

Background:
* I am 22.
* From Baku, Azerbaijan (close to Turkey, Iran, Russia).
* GMAT 680 (Q-50, V-31).
* BSc in Applied Math and Computer Science, and GPA – 86/100 from a local university . Full Scholarship.
* Exchange student for 2 semesters in a small 4-year college in the US. GPA - 3.53/4.00 . Fully funded by US State Department.
* 14 month of part-time work experience before graduation as a web developer (7 month in BP)
* 10 month (by July, 2015) of full-time work experience after graduation as a Project Specialist / Junior Project Manager for the European (Olympic) Games in a multi-national team.

Career Aspirations :
* Plan A – Entrepreneurship.
* Plan B+ – Management Consulting (MBB, Accenture), VC, or mid-stage start-up.
* Location : Almost no personal preferences : US (startup hubs) or London.

Case:
* I am admitted to LBS Masters in Management. However, I think the US is better for Plan A : Entrepreneurship, and Plan B : Employment of a non-US / non-EU citizen in the US or London.
* The programs that I liked and I am eligible for are : Fuqua MMS, Kellogg MMS, NYU (Polytechnic) Management.
* The problem is that Jan, 23 is the dead-line to pay LBS Commitment Fee, that equals 6.000 GBP. And this is a considerable amount of money for me.
* As one more option : LSE : If LSE is not much worth than LBS.

To remind you the questions:
a) Are Fuqua, Kellog, and NYU much better than LBS and worth turning down an offer from LBS (by not paying the Commitment Fee) and taking the risk?
b) Are my chances of getting into Fuqua, Kellog, and NYU high enough to make it worth taking the risk?

Thank you for your time. You experience and point of view are valuable and can make a change. Please share your opinion.