What should I Prefer between Chemical engineering and civil engineering?

After matching my total marks from answer key of jee adv. I am qualified for Old IITs(like IITM, IITB, IITD, IITR, IITK etc.? and I am confused to what to choose between Chemical engineering and civil engineering in these IITs .
Please guide me .
Please provide some factual and data based info about avg packages and top packages.

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