Which one have scope and high salary cs engineering or automobile or aerospace which cllg is best expect iits and nits

All the three branches have good scope in the engineering. It totally depends on your interest.
If we compare these branches then CSE is the most demanding branch among students. It provides good and maximum packages to the students.

You can check the top colleges below

Computer science Engineering

Delhi Technological University, Delhi
Manipal Institute of Technology, Manipal
Birla Institute of Technology and Science, Pilani
International Institute of Information Technology, Hyderabad
VIT University, Vellore
Thapar University, Patiala

Automobile Engineering

Top GFTIs
Indian Institute of Information Technology, Design & Manufacturing, Kancheepuram
Pt. Dwarka Prasad Mishra Indian Institute of Information Technology, Design & Manufacture Jabalpur
Birla Institute of Technology, Mesra, Ranchi
Gurukula Kangri Vishwavidyalaya, Haridwar
Institute of Infrastructure, Technology, Research and Management-Ahmadabad

Private

Birla Institute of Technology & Science (BITS)
VIT University
SRM University
Manipal University

Aerospace Engineering

SRM University
Jain University
Amity university
Indian Institute of Space Science and Technology

Good luck!!