Main
Model
Price
Advantages
launch
Announced
Body type
Camera subcategory
Sensor
Effective pixels
Max resolution
Sensor size
Sensor type
Processor
Image ratio w:h
Other resolutions
Sensor photo detectors
Image
ISO
Boosted ISO (minimum)
Boosted ISO (maximum)
White balance presets
Custom white balance
Image stabilization
Uncompressed format
JPEG quality levels
Photography features
Minimum shutter speed
Maximum shutter speed
Aperture priority
Shutter priority
Manual exposure mode
Subject / scene modes
Built-in flash
External flash
Continuous drive
Self-timer
Metering modes
Exposure compensation
AE Bracketing
WB Bracketing
Screen / viewfinder
Articulated LCD
Screen size
Screen dots
Touch screen
Screen type
Live view
Viewfinder type
Viewfinder coverage
Viewfinder magnification
Videography features
Resolutions
File Format
Videography notes
Microphone
Speaker
Optics & Focus
Autofocus
Digital zoom
Manual focus
Number of focus points
Lens mount
Focal length multiplier
Physical
Weight (inc. batteries)
Dimensions
Environmentally sealed
Battery
Battery details
Battery Life (CIPA)
Storage
Storage types
Storage included
Connectivity
USB
HDMI
Wireless
Wireless notes
Remote control
Microphone port
Headphone port
Other features
Orientation sensor
Timelapse recording
GPS
GPS notes
Samples
Videos
Summary
The Canon EOS 5DS R highest resolution of 8688 x 5792 pixels (51 megapixels) is better than the Canon EOS 5D Mark III highest resolution of 5760 x 3840 pixels (22 megapixels). The Canon EOS 5DS R has more presets of white balance - 8. It gives the camera owner more control over colour.
The Canon EOS 5D Mark III battery life is better than the Canon EOS 5DS R battery life. In accordance with CIPA standards the camera owner will be able to take 950 photos with the EOS 5D Mark III and only 700 with the EOS 5DS R. The Canon EOS 5DS R weighs 930g which is 20g less than the weight of the EOS 5D Mark III. The EOS 5D Mark III can utilize optional accessory GPS devices. Recording GPS data can be useful if you like to travel, to be able to go into the photo metadata and see exactly where a photo was produced.
Taking into account the above differences the Canon EOS 5DS R will be the best choice. Get the lowest price on Amazon.