The Duo's battery must power two displays, making real-world endurance a key consideration.
Both support 25W MagSafe and Qi2 wireless charging.
The Pro Max wins for predictable endurance, while the Duo remains competitive for users who prioritize its larger screen.
Multitasking and productivity give the Duo its biggest advantage, as its foldable display is designed for running multiple apps.
Gaming and entertainment also benefit from the larger 7.6-inch internal screen when unfolded.
The Duo folds into a compact phone, making it more adaptable for portability.
Storage and connectivity are identical: 256GB to 2TB, Wi-Fi 7, Bluetooth 6.0, and USB-C 3.2 Gen 2.
The iPhone 18 Pro Max ultimately offers a more balanced flagship package with better cameras and value.
The iPhone Duo delivers a more versatile foldable experience for those willing to pay around $2,000.
Specs are based on available data and actual performance may vary; verify details from official sources before buying.
