Comparing ISB with IIM's is foolishness. They aren't comparable. IIM is a 2 year MBA program where as ISB is a one year program. IIM is quite established institute where as ISB is still a novice. ISB will take only experienced people where as IIM will take freshers too. You can't expect much of peer learning in IIM's. But yes, may be they will arrange guest lectutes and all that stuff.
If you think in terms of placements, IIM's gets jobs easily because most of the students are freshers. Getting jobs for freshers is lot more easier than getting jobs for experienced people. Experienced people will have specific requirements.
PS:All I wanted to say is IIM and ISB are different and they are not comparable.
