I buy both. My favorite type of quilts are the "I Spy" - especially for children. So when I look at fabric I look to see how it repeats the subject and how I would use it. There are some fabrics that I want yardage because I want to use it for background, sashing, and binding. Fat quarters are nice when I need a variety, same with jelly rolls. For me I need to pre-wash so I don't care for too small of pre-cuts, so I have the Accuquilt Go to cut my own.