These are totally different course from each other.

It totally depends on your interest which course you want to prefer.

Aeronautical Engineering- If you want to make your career in aircraft, airplanes, jet planes and space shuttles you can opt for aeronautical engineering. 

Average salary in this field is around Rs. 40,000 to Rs. 50,000 per month.

LLB- If you are interested in law field you can opt for LLB.

It is one of the highly paid professions. 

Good Luck!!