The larger the sensor the more light the sensor captures yielding in better image quality.
13.2 x 8.8mm
Polaroid Snap: 81.2 x 25.4mm
3. focus points
The more focus points the more flexibility in picking which part of the scene to focus on. They also give the image sensor a better probability in identifying the right area of the scene to focus on in more automatic modes.
Sony Alpha a9: 693
4. continuous shooting at high resolution
Fast continuous shooting is useful for catching action shots.
Olympus OM-D E-M1 Mark II: 60fps
The maximum ISO at which the device still captures excellent quality images. Source: DxOMark.
Sony Alpha 7S: 3702ISO
HTC Re: 65.5g
7. image quality
A device's overall image quality score considers: color depth, dynamic range and low light performance. Source: DxOMark.
Sony Alpha 7R II: 98
8. maximum light sensitivity
With a higher light sensitivity (ISO level), the sensor absorbs more light. This can be used to capture moving objects using a fast shutter speed, or to take images in low light without using a flash.
The bigger the screen size is, the better the user experience.
Samsung Galaxy Camera 2: 4.8"
23. has AF tracking
With AF tracking, once you choose the subject and press the shutter release part way down, as the subject moves, the autofocus will follow it. No more out of focus shots.
Nikon 1 V1
72% have it
24. has GPS
GPS enables global positioning, useful in map, geo-tagging or navigation apps.
Nikon 1 V1
15% have it
25. Has timelapse function
A timelapse shows a long passage of time sped up. A series of photographs taken from the same position over a long period is joined together to create a short video. It is great way to capture things like the setting sun, or clouds moving across the sky.