I will first give you a brief about each. Civil deals with building houses, bridges etc. Metallurgy deals with building high quality metals which are then used in houses, bridges, cars etc.
I’ll compare these two at NIT Jamshedpur to help you with your decision-making-
I recommend you research both these branches and then make your decision. If you have interest in one of these, go for that branch. Other than that, as per me, the Metallurgy branch is better.