Which one should I prefer: IIIT Allahabad dual, IIIT Amethi IT, SGSITS (Indore) ME, or MANIT Civil?

First of all, forget about SGSITS Indore as it stands nowhere in front of IIIT and MANIT. If you are looking for good placement and salary then forget MANIT Civil too. The only options you are now left with are - IIIT Allahabad dual and IIIT Amethi IT. Clearing things about IIIT Amethi, it has been closed and have been moved to IIIT Allahabad.

The table shows a brief overview of the institutions:

There is no point in spending extra two years pursuing M.Tech at IIIT Allahabad because if you are interested in a PG Degree then you can prepare for GATE during UG. Doing so will get you admission at any IITs which would be better for your career.

It is better to go for IIIT Allahabad and if you feel to go for PG then prepare, get a good score and go for IITs. Otherwise, you can always go for placements and will probably land up a very good job.