WorkOutDoors has several advantages over the Workout app:
Swipe between multiple data screens, each with configurable layout, text size and data content;
Each screen can be fully configured using a pool of over 180 metrics, graphs and buttons;
Fully functional vector map that can be stored on the watch for offline use;
Compass and route breadcrumbs shown on map (which also auto-rotates);
Limit alerts (heart rate, pace, cadence etc);
Interval notifications (time, steps, ascent, calories etc as well as distance);
Export workout as a GPX file, or directly upload it to Strava;
See GPS signal strength before starting a workout (to wait for a lock);
Upload and display GPX routes on watch map to aid navigation;
Define a target speed and see metrics showing performance against it;
See target speed as a moving icon on the map for visual comparison;
Multiple configurable rolling pace and speed metrics;
Many heart rate zone metrics, based on user-configurable zones;
Very powerful analysis in WorkOutDoors iPhone app;
Loads of other stuff...
www.workoutdoors.net
Full disclosure: as the developer I am very biased!
🙂