Use electrolyte drinks instead of sports drinks when the main job is fluid plus minerals rather than fluid plus minerals plus carbohydrate. The distinction lives on the label: sodium and other electrolytes may be present in both, but sports drinks usually add meaningful sugar or carbohydrate.
That does not make one category healthier or better for every workout. Short easy sessions, long hot outings, endurance events, stomach tolerance, diet, and medical context all change whether the user wants electrolytes alone or a combined hydration-and-fueling drink.