Hey Goodfellah,
I'm actually very surprised, because my first choice, which was still pending when I posted this, was LBS!
Even though I wanted to study entrepreneurship, I decided to go for LBS. I felt like the quality of the faculty and students it recruited was amazing, and I wanted to be surrounded by them. My second choice was the ESADE CEMS, so I would have done an MiM anyways which made my LBS decision certain. LBS still has cool entrepreneurship related stuff such as a very interesting elective, a trip to silicon valley and a start-up incubator with a good track record.
As for Esade and Bocconi, I decided that Esade was a better choice. My impression through the admissions process was much better - Bocconi didn't interview me, ask for letters of recommendation, and barely asked me to write an essay. For Esade, you must have met Albert and felt the great 'close' community the school tries to encourage. The course is also more focused towards starting your own business, while Bocconi's EMIT is a hybrid of innovation, economics a strong focus on IT. I personally wanted to focus on the entrepreneurship aspect. Finally, while Bocconi doesn't disclose its average GMAT, I got the feeling that ESADE was more selective. I am sure that the ESADE CEMS is harder to get into than the Bocconi EMIT, although the Bocconi CEMS might be on par with ESADE. The biggest downside to ESADE will be the long commute every day, as the campus is far from the city (and I read most graduates still choose to live in Barcelona)
If you care about employability (which you may not if you want to be an entrepreneur), I would rank them the same -> LBS > CEMS > EMIT.
To list a couple exceptions, you may favour ESADE or Bocconi if you really want a 2 year course (with the ability to intern in between), as LBS is only 1 year. Also, if you plan to work on Spain or Italy, employers will value that degree more than usual, and your contact network will also be strong there. Finally, as the course content is quite different in all three, a very strong preference for one matters - it's not all about statistics.
Obviously this is just my own decision process, and you may have some other priorities, but I hoped it helps you and anyone else reading. It was definitely a really hard decision for me. Let me know if you end up coming to London!