What is the best graft for this case (an isolated area of gingival recession needing predictable root coverage)?

For predictable root coverage of an isolated recession defect with good color/texture blending, a subepithelial connective tissue graft is considered the gold standard. A free gingival graft is better suited for increasing the width/band of keratinized tissue (with less reliable esthetic root coverage), and a lateral pedicle flap requires adequate adjacent donor tissue, which may not be available or ideal in all cases.