Spanx, girdle, or belly binder, which is best?

Depends: They all work slightly different, so it depends on what you are trying to treat. Spanx give mild support so good for minimal tumult or bulge control but ver comfortable. Girdle has firmer control so works better for more significant bulges, but much less comfortable. Belly binder may help since the waist. All three have some limited use after surgeries like liposuction and hernia repairs.