CSE is the easiest for average student.
CSE is most friendly with average students.
The theoretical scope of CSE is very limited( which makes it easy but one has to be good in that as well) and practical applications are wide( makes it interesting).
So lot of things can be done in the student life itself to realize the CSE as an application.
But it doesn’t mean that you don’t have to work hard. There is no substitute to Hard work and sincere efforts irrespective of the field.