It depends on your interest.Computer science is very easy and interesting once you fall in interest with it. You need to have passion for 'computers', and 'science' behind its working. That's exactly the domain of computer science. If you are interested in programming and maths, then definitely you will get success in this branch.

computer sciencei is the main branch whereas Data Science is a branch of Computer Science . The Computer Science deals with algorithms with more focus on software engineering and development. Data Science is the combination three fields' data engineering, maths, and statistics.