I think your question is a bit incorrect and I am assuming that you are asking whether bit mesra is better than iiits or not so if you talk about streams that are common in both institutes then the old iiits are far better than bit mesra in whatever manner you talk about be it placements both average and percentage be it infrastructure be it faculties be it competition and above all iiit tag I would not say  the same about new iiits but yes old iiits are far better than bit mesra as they attract top minds from india coding culture is great and better infrastructure also even the new iiits will grow at a fast pace an soon overtake bit mesra so if you get a chance to study in iiit then don't miss it