The Harley-Davidson Road Glide and the Indian Challenger are two popular touring bikes. The Road Glide has a Milwaukee-Eight 107 engine, while the Challenger is equipped with a Thunder Stroke 116 engine. The Road Glide is known for its comfort and stability, while the Challenger is known for its power and agility. The Road Glide has a traditional look and is available with a variety of customization options, while the Challenger has a more modern look and offers a range of advanced technology features.