There are some overlaps between the topics in the two disciplines. However, the crude way to distinguish between them is that CS is concerned with Software, and ECE is concerned with Hardware. In CS we are concerned with how to make computers do what we want using software, while in Computer Engineering they are concerned with designing and building the computers themselves. However, some topics, such as designing, building, and evaluating networks of interconnected computers, cross the boundary. Of course, to find out the details of both disciplines you ought to attend presentations from both departments, visit the web pages, and talk to faculty representatives.
Computer technology changes very rapidly.
It's estimated that the details of what you learn in a B.S. degree may last you about 5 years. However, we try to prepare you for change by emphasizing CS concepts that will support you as you continue to learn throughout your career. With those concepts you will be able to learn about computers and languages that will only be invented after you graduate. Computer Science concepts change relatively slowly. Your friends who choose immediate money over an investment in education will lose in the long run.