Samsung has successfully taken AMOLED screens from a rare breed to a must-have status. The Super AMOLED on the Galaxy S7 is the most technologically advanced yet.
It's brighter than the S6 screen, reaching around 400 nits in manual brightness mode. The true maximum is closer to 540 nits, but that's available only under automatic control of the brightness.
It can be very dark too - the minimum brightness is just 2.1nits. Even when you wake up in the middle of the night to check something, you won't be blinded.
The screen has an Always On feature too. As discussed, it uses 1% of the battery charge per hour, but you see the time and date plus missed calls and messages. Unfortunately, no other notifications are shown (e.g. WhatsApp, Facebook or others).
The Samsung Galaxy S7 screen has the most accurate colors of any mobile display as well. We measured an average deltaE of 1.7 and even the maximum of 2.3 is very low.
Note that this is in Basic mode, Adaptive mode boosts contrast and saturation to make images pop, but it takes the average deltaE up to 7.1.
For techies: Basic mode targets the sRGB color gamut while Photo mode aims for the wider Adobe RGB. You'll need photos shot in Adobe RGB to appreciate it, though, most content on the web is sRGB.
Apple's supply chain magic allows it to source high-quality screens that put up a good fight against the Samsung panel.
The maximum brightness is essentially the same, 540 nits, and it is available to the user with the manual slider (AMOLEDs wear out quicker at max brightness, so Auto mode is designed to prolong their life).
Contrast is a stellar 1,500:1. In a well-lit room you won't see a difference, but in the dark, you will notice faint light seeping through the black areas of the screen (but not on the Galaxy S7).
The screen is quite accurate too, we measured an average deltaE of 3.6. With calibration, you can get a typical screen under 4, so the iPhone 6s is ready to go right out of the box. Not that you could calibrate the display, Apple wouldn't let you tinker there.
The Samsung Galaxy S7 display reflects less light than that of the iPhone, so even at 400 nits, it's more legible under direct sunlight. Switching to Auto mode extends this difference further.
Winner: Samsung Galaxy S7. As if we have to spell it out - the sharper, better calibrated screen usually wins, but this one has the bonus of Always On mode. Sure, you can get it at a lower cost with a Motorola or even a Lumia, but that doesn't diminish its impact.
The Samsung Galaxy S7 has a massive advantage in battery capacity - at 3,000mAh, it has 75% more milliamps in its tank than the iPhone 6s. Apple is known for its great optimizations, but there's only so much rabbit you can pull out of a 1,715mAh hat.
The Endurance rating isn't as different as the battery capacity suggests. The Galaxy S7 can last an average of 80 hours between charges, that's over three days. The Apple iPhone 6s can go for 62 hours.
If you're planning to use the Always On feature of the S7, however, you should be prepared to charge more often - the Endurance rating drops to 49 hours (Samsung says the feature draws 1%/hour, so Always On alone will deplete the battery in twice that time).
The call times are much closer to what you would expect based on battery capacity. The iPhone 6s can't break 10 hours, so chatty users will get antsy when their battery drops below 20%-30% while S7 users can chat away.
The Galaxy S7 did 9 and a half hours of web browsing, the iPhone lasted longer. Note that using Chrome instead of Samsung's browser gave a better result, by an extra 1 hour.
The video playback test went heavily in favor of the S7, so media buffs can enjoy videos with less of an impact on the phone's endurance.
Pushing electricity in the other direction - back into the battery - happens much faster with the Galaxy S7. Samsung packaged the phone with a Quick Charge 3.0 charger, which can fully charge the phone in 90 minutes (0%-100%).
Samsung sells fast wireless chargers, based on the Qi standard (the S7 also supports PMA). They are "40% faster than standard wireless chargers." These chargers require a 9V/1.67A adapter (basically, Quick Charge 2.0) though wireless charging is not 100% efficient, so less reaches the battery.
Apple, meanwhile, continues using 5V/1A chargers, which take a while even with the relatively small battery they have to fill up. You can speed things along if you use an iPad charger.
Winner: Samsung Galaxy S7. Honestly, we would give it the win just for the fast charging. It changes how you use a phone - you can just plug it in early in the morning and it will have enough charge for the day before you're out of the shower. It could last more than the iPhone 6s, but only if you disable the Always On screen mode.