If your son wants to persue engineering, let him decide which branch is favorable for him as once selected now this will be his future and if he won't enjoy his engineering it would be very difficult for him to survive 4 years in a college with that branch. He shoukd think about his strong subjects and his interests and chose wisely.
I have provided a link below you can comoare different branches their job opportunities and package.
https://www.shiksha.com/b-tech/articles/highest-paying-engineering-branches-know-top-recruiters-salaries-offered-blogId-8228