Your decision completely depends on your priority as to what is the most important to you, the branch or the college. Being a graduate from NIT Agartala, I would suggest you go for NIT Agartala rather than NIT Mizoram.

• If college is the most important to you then you should go for NIT Agartala. The infrastructure is far better than most of the NITs.
• You may have to face some trouble regarding the faculties as they are not up to the mark.
• If the branch is your priority go for ECE, however, Production Engineering also has grown as a department. You can make your careers in Supply Change, Quality Management, and Control, etc.
• Other than this, your choice should depend upon the location. Give preference to the one that's closer to your home.
• Both the colleges are tier 3 Indian engineering colleges and the graduates have been working in companies with a package of 3 to 4 lakhs per annum.

Both branches are equally good in their own ways. But ultimately it is your decision to choose where you want to study. It is suggested that you go for NIT Agartala as it is a more experienced institution than NIT Mizoram.