I am just now completing a certificate in graphic design at the online school Sessions.edu, and although I have come to like the Adobe Creative suite tool (and mainly inDesign), I would rather be relying only on open source tool. Why is that? Well there are many factor that steer my decision toward that.
If you want to read more about open source and creativity I invite you to read FLOSS+Art which is a solid explanation of the relationship between open source and creativity/art. From the description:
The Five Simple Steps website has a responsive design with a neat feature. When the browser window is narrow, the menu in the upper right converts from a regular row of links into a dropdown menu.