Oh, the list is pretty long:
Dual edge screens, VR, quick charging, wireless charging, SD slots, retina scanning, native stylus support, a QHD screen with HDR, 4GB of RAM, a 3500 mAh battery, an always on display, the best brightness on any display on the market, proper widgets, wide angle lensed front facing camera, a camera that is as good as the S7/Note 7, Touchwiz features like split screen multi-tasking, smart features like smart alert, Touchwiz shortcuts like double tapping the home button for the camera, Google Now and Google Now on Tap, the new MIMO features for Wifi, Samsung's White Pages spam services, a better designed phone with slimmer profiles while having more mAhs for battery life, Water and Dust resistance, fast wireless charging, USB Type C standard, soon the headphone jack will join the list, AMOLED tech, more storage space as the baseline (64GB or higher), heart rate monitor, more flexibility with wearable technology, less ugly antennas at the back, Gorilla Glass 5, better ergonomics, etc.
That's without listing many of the Android software advantages. Ask Apple to include a lot these features and maybe they can play catch up in 2017 or 2018.