In simple terms, the CS degree will train you to be a programmer, while the IT degree will train you to be a technical support professional.
To decide which degree to pursue, try to imagine the type of job you want when you graduate. If you dream of writing programs for a software development company (Google, Microsoft, …), then choose the CS degree. If you like to install hardware/software, set up and administer a network, manage a web server, do simple web programming, and administer a database, then choose the IT degree.