Ruby on Rails (RoR) is increasingly favored for developing Single Page Applications (SPAs) due to its ability to enhance performance and user experience. The document outlines the advantages of RoR, including its asset management, security features, and community support, while also highlighting its disadvantages such as debugging challenges and incomplete documentation. Despite the drawbacks, RoR remains a strong choice for web application development, encouraging developers to weigh benefits and challenges when transitioning to SPAs.