IIML is clearly superior to MDI in non-marketing specializations in terms of placement. However, IIM I, K, and MDI are generally equal in terms of placements, except for a few banks that specifically seek out the IIM tag at I&K. If you work equally hard at either campus and all other operational factors are constant, you will likely end up in a similar position whether you choose MDI or I or K. However, as mentioned before, IIML still has the edge and requires more effort if you're in the finance or consulting field.
If you're interested in MDI, it's worth noting that recent placement reports show more and more prestigious finance and consulting companies are visiting the campus. This has helped MDI deliver well-rounded placements. So, if you're willing to put in the work, MDI could be a good option for you.