Which NIT is better for civil engineering, NIT Hamirpur or NIT Jamshedpur?

Since you are enquiring about the same branch at two different institutes, it's best to look at the overall rankings first.

• NIT Jamshedpur's B.Tech ranking by NIRF is 101 out of 200 colleges in India in 2023 a
• NIT Hamirpur's Overall ranking by NIRF is 151 out of 200 colleges in India in 2021 

The rankings place NIT Jamshedpur higher than NIT Hamirpur. These rankings are based on various factors like academics, research facilities, placements, etc. I had a friend at NIT Hamirpur who claimed that the research culture there is pathetic and the college administration is not supportive at all.

PLaxements-wise, the scenario is similar everywhere as Civil has the least job opportunities. You might check the cutoffs to get an idea of the credibility of the specific branch. Here is a brief comparison of the civil branches of both institutes

You might want to talk to alumni and conduct more detailed research before choosing your college!