I buy 1/2 yard cuts. I make scrap quilts and this works great.
For me buying yards of the same fabric doesn't make since, if I don't have a specific quilt I'm working on. It may depend on the size of quilts and what kind of quilts you are planning to make. Crib? Kids? Lap for the elderly? I'd rather have
6- 1/2 yard pieces than a 3 yard piece. Much more versatile.
I am also limited on space, so I have to make enough quilt tops to use up some of my stash before I have room to buy more fabric. LOL Plus, I think our tastes change in fabric as well as the type of quilts we make. This is another reason not to go overboard on buying a lot of yardage at a time.
Have fun buying fabric which ever way you decide to go.