Bistrot Caraibes would be my vote. We've spent a week in Grand Case several years and have eaten at most of the restaurants multiple times. We have never been disappointed with Bistrot Caraibes. We like La Villa but consider it a step down in quality and innovation. Le Cottage is excellent, too, but their meals feel slightly heavier and sometimes overly rich or complex for our taste. Favorites at BC are lamb, scallops and sea bass..always wonderfully fresh ingredients enhanced but not overwhelmed in the preparation and beautifully presented.