Now coming up from the world of technology, Apple has expanded its smartwatch lineup with the new Apple Watch Series 12 and Apple Watch Ultra 4. Both watches bring new health and AI-powered features, including Health Age, Audio Intelligence and Siri AI, along with improved battery life and faster charging. But there are some key differences between the two, especially when it comes to design, durability, and battery life. Here’s everything you need to know by NDTV's AI & Tech Editor, Aayush Ailawadi