You can stick to FMS Delhi. It is in the same league as IIM A, B, and C.
Before you narrow down your decision, you should consider which sector you want to join, i.e. consulting/core finance/marketing, etc. Go through the placement highlights of both these institutes and see which offers better placement in the sector you are interested in.
The question totally depends both on you and your abilities at taking decent risks at hand, such as considering which particular domain you want to enter and if it is anything between Finance or Consulting, then taking a drop will probably make better sense.
There other points to take into consideration to:
Taking all of these into action, what if the next year when you get into a different sector, you fail receiving a call from the company you have aspired for?
Understanding these questions personally will affect positively in the long run if utilized properly.
However, joining FMS will keep you on the safer side, and it is because:
Since FMS have only countable students, you can expect a higher salary too with almost zero chances of not getting placements (it is considerable based on your performance at PGDM). Nonetheless, even CAT is somewhat uncertain. Also this depends on each individual and their approach towards every potential situation.