I agree, it depends on what you are doing. I am more prone/attracted to picture or art-type of quilts which the fat quarters are handier say to cut a little lady's dress to be appliqued, or a house, or odd shaped pieces of a background. If I do buy WOF, then I get 1/2 yd and essentially have 2 FQ's, then I can go either way. If it is just a neat fabric in a pre-cut FQ, then I will pick it up to add to my stash. Wmart sells the FQ's for 97 cents each, unless you buy a matched sequence, in which case it is $7.84 for 5 FQ pieces. And since their big remodel, even the pre-cuts seem better quality.
Mary