The larger the sensor the more light the sensor captures yielding in better image quality.
35.9 x 24mm
Polaroid Snap: 81.2 x 25.4mm
23.5 x 15.6mm
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
6. has a flip-out screen
Flip-out screens are useful for doing tricky shots.
27% have it
7. 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.
Nikon D7500 + Nikon AF-S DX Nikkor 18-140mm f/3.5-5.6G ED VR: 1640000 ISO
8. 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
9. longer battery life
CIPA is an independent, standard measurement that determines how many shots a camera can take before the battery dies.
Nikon D3x: 4400shots
10. video recording
2x better video recording quality.
1080 x 30fps
Canon EOS 1D X Mark II: 2160 x 60fps
1080 x 60fps
11. Has WiFi
The device can connect to WiFi.
37% have it
12. color depth
The better a device's color depth the more color nuances it can distinguish. Source: DxOMark.
HP Photosmart R927: 42bits
13. has a stereo microphone
A stereo microphone allows to record audio files or movies in stereo without an external microphone.
50% have it
14. Faster video autofocus due to a phase detection autofocus when shooting movies
A phase detection autofocus is much faster than a contrast detection autofocus and allows sharper movies.