95% of commercial of gamebird operations raise their breeders over wire floors or in small batteries. They still experience a normal level of thrift per bird in those settings. No one has proven birds to be more thrifty in different types of cage settings. How well quail lay, if all other things are equal (feed, water, space allowed, genetics), will relate directly to the stress level of the birds. Things like positioning of the cage in your environment (i.e. next to a busy street) or what the birds can see from their cage can easily cause enough stress to hamper thrift. It is easier to stress birds kept on wire but that is all on the keeper no the birds.
I raise birds over both sand and wire and over their life there is very little difference. The birds raised on sand tend to look a little nicer because the ground doesnt abrade their feathers like the wire does.