Here you should consider two factors that if you leave nit jamshedpur then you will leave the nit tag which is very important on the other hand if you leave hbtu then you will leave chemical branch so you should be sure what risk you are going to take in my opinion nit jamshedpur metallurgy is better as it gives you an nit tag plus you study with top minds of india which is great in itself moreover metallurgy is not too far away from other core branches so it is better rest is your pick choose wisely.