The Oura Ring Generation 3 is a more advanced smart ring with more features and better build quality, but it comes at a higher price point. The Ultrahuman Ring AIR is a more affordable option with basic health tracking features. According to a review by Wirecutter, the Oura Ring Generation 3 has 'the most comprehensive set of health metrics' (per Wirecutter). However, a review by CNET states th...