my son got 2118 in jee advance, he is not interested in any kind of research branch, which is a better option Industrial and production from IIT delhi or mechanical from guwahati he want to do MBA from abroad afterwards

IIT Delhi is better than IIT Guwahati...
Mechanical engg contains different working profile....1..Design exploration(tool level or automative) using s/w programming....2. Piping design in process industry … 3. Industrial production...
So, both the branches are equivalent.....

As you are asking for MBA afterwards, than i would like to advice you for IIT D Industrial and production and than MS from MIT Messachussets in Industrial design and process...

After 6 year, result would be better as of now...