Both lines are driverless and efficient, but here's when to use which:

Line 1: Best for classic tourist route (Louvre, Tuileries, Champs-Élysées, Bastille). Runs east-west across central Paris. Stations every 500m so frequent stops but covers more ground.

Line 14: Faster for cross-city travel with fewer stops. Best for airport connections (connects to RER B at Châtelet). Express-style service with stations 1km apart.

Speed comparison: Line 14 averages 40km/h between stations vs Line 1's 30km/h due to stop frequency. For Châtelet to Gare de Lyon, Line 14 takes 8 minutes vs Line 1's 15 minutes via multiple transfers.

Platform doors on both lines eliminate delays from passenger boarding issues. Most reliable lines during rush hour and strikes.