Both branches are good in their own ways. Its you who has  to decide where exactly your interest lies. On one hand, Computer science involves learning various programming languages, artificial intelligence, machine learning, etc. Its a great upcoming branch. It involved making codes and changing all the manual things into computer based systems which are easy to handle and accessible.

Refer to the site below to know more about CSE -

https://www.careers360.com/courses/computer-science-engineering-course

Electronics and communication Engineering on the other hand, includes making switches, routers, modems, etc to enhance the speed of communication system. They are also responsible for developing test prototypes of integrated circuit components.

Refer to the site below to know more about ETCE -

https://engineering.careers360.com/articles/electronics-and-telecommunication-engineering-0

Best wishes. Thank you.