It has physical buttons tied to Apple features such as the Home button for when on Apple TV. The controller is designed to work across Mac, iPad, iPhone, and Apple TV. Looking even solely at the Apple controller market, this is by far the best option out there, especially for iPhone. So while the controller is a $20 premium than the other SteelSeries controllers, we find the price justified.
Not to mention Apple's MFi licensing fees for a controller and the Lightning port. These help make up for the higher price tag found on the Nimbus+. It also sells the phone grip as an add-on rather than bundled. The Stratus Duo only sports a 20-hour battery life compared to 50 on the Nimbus+. It offers a very similar design to the Nimbus+ but there are several differences between the two.
In SteelSeries lineup, they also offer the Stratus Duo. With Apple Arcade continuing to release new titles each week and iOS and tvOS gaming at an all-time high, this controller comes at the perfect time. This is now a controller worthy of the Apple ecosystem taking advantage of all the MFi controller specs available.