Every branch is the best at it's place. There is no as such good or bad branch in engineering. Each branch comes with its pros and cons.
Metallurgical branch is the new emerging branch with more specialization than that of civil. Civil branch has been in the business since a very long time. since not many students are into metallurgy the competition in this branch is less as compared to civil branch. So, metallurgy becomes a plus point for students preparing for GATE. Since the civil branch has been there for a long time the job opportunities are more as compared to metallurgy branch. But, the competition for placements is also higher than the metallurgy branch as a large number of students opt for the civil field.
So, go for the branch you are interested in.
Hope it helped.
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