Interesting question. To be honest, it never occurred to me that anyone would attend IE if IMD was an offer unless they either needed a Spanish-speaking network (in which case, take a less demanding course there) or just didn't want to work very hard (of course IE is demanding but IMD is at a much higher level). That said, you are right that IE alumni are very Latin, with everything that means, and IMD alumni are.... not so much. I do think that the IE network is more helpful and active, partly because they are much more junior on average.
Many thanks for your comment. However, I don't really think a difference of 2 years in the class age avg would make IE junior to IMD, IE is 29 with range (24 to 38) and IMD 31 with range (27 to 37), I see them pretty much the same. In fact, LBS class profile for the classes of 2014 and 2015 was 30 and 31 respectively. Yes, can you imagine LBS full time MBA average age was 31, and it is two year program and ranked top 5 worldwide!
My inquiry about the differences in prestige and alumni value, is it worth it to turn down IMD for IE, because I felt IE alumni are much more supportive and welcoming. I know IMD in general is better quality and somehow enjoys better brand, What you think of IE in general compared to other schools? is it worth the investment?