What are the pros and cons of spending two years at a community college vs going straight to a 4-year university?

This is a great question! Personally- I completely support doing two years at community, and then two at university. I did this, and it saved me thousands of dollars. I received a great basic education, and all of my credits transferred into university.
I would recommend to look into the university that you would like to transfer to and see what their prerequisite classes are. For example, one school wanted physics, but the one I wanted was asking for statistics instead. So it helps to know what is required of you before you start taking your courses. I see no negative difference in doing community college first. Take it from me! Good luck!