Hey aspirant,

You asked for the comparison among mechanical engineering in IIT Jabalpur, metallurgical engg or chemical engg in top NITs.

Now, look, top  nits are much better than low iits. IiT Jabalpur established in 2005 & it's a medium good iit. So, mechanical engineering department in this iit is good for placement & academics. You may go for it. Chemical engg in top nits are good also compared to metallurgical engg for placement & future.

So, mechanical engineering in IIT Jabalpur is the best option.

You may go through this jee advanced college predictor tool :

https://engineering.careers360.com/jee-advanced-college-predictor?icn=QnA&ici=qna_answer

All the best   !!

:)