To some extent, my answer would depend on whether of not you plan to bring children.
Chefs is very family friendly. They've got a child menu, and it's pretty bustling and noisy. It's a great choice for a family with little ones. They get you through your meal and out pretty quickly.
Bistro has no child menu (big hint right there). It's expensive, intimate, and quiet, and your meal will take much longer. Very much the fine dining experience.