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Salary totally depends on where you go for a job.
In IT, it is well known that government jobs are less, and also paid less, but in private companies which are leading in the market can offer you overwhelming packages.
In civil engineering, private companies offer less paid jobs, but large growth rate while government job will have to cross some barricades, like GATE or ESE for getting a much satisfactory pay and perks.
But lastly, when you become a professional, the thing matters is your work satisfaction and working hours. In that case, IT field has a bad review. If you don't get a campus placement, it is tough to get a job.
If you are mad about getting a huge salary, opt IT, learn different coding languages, be a master of coding with at least knowledge of 30 coding languages and bag packages of crores in renowned companies like Google, Microsoft etc. These companies give work satisfaction too, but you have to be boon for them too.
Discussing chances of going abroad, both the branches have similar opportunities. But, new immigration rules of USA diversely affected it. In IT field, the USA covers most of the opportunities. While in civil, you can go to Germany on Dart scholarships. France, UK, Japan, Sweden etc. are the various option for MS.
First, find your interest and be mad about it, because without interest, you are going to be bored at work and give up.