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Main
Model
Price
Advantages
PHOTOGRAPHY FEATURES Subject / scene modes: Yes
PHOTOGRAPHY FEATURES Built-in flash: Yes
PHOTOGRAPHY FEATURES Continuous drive: 6.5 fps
SCREEN / VIEWFINDER Articulated LCD: Tilting
SCREEN / VIEWFINDER Screen dots: 1,229,000
VIDEOGRAPHY FEATURES Microphone: Stereo
PHYSICAL Weight (inc. batteries): 750 g (1.65 lb / 26.46 oz)
PHYSICAL Battery Life (CIPA): 1230
OTHER FEATURES GPS: Optional
Main
Model
Price
Advantages
SENSOR Effective pixels: 51 megapixels
SENSOR Max resolution: 8688 x 5792
SENSOR Sensor size: Full frame (36 x 24 mm)
SENSOR Sensor photo detectors: 53 megapixels
PHOTOGRAPHY FEATURES Maximum shutter speed: 1/8000 sec
OPTICS & FOCUS Number of focus points: 61
Summary
The Canon EOS 5DS highest resolution of 8688 x 5792 pixels (51 megapixels) is better than the D750 highest resolution of 6016 x 4016 pixels (24 megapixels). The Canon EOS 5DS is equipped with bigger sensor compared to the D750: Full frame (36 x 24 mm) versus Full frame (35.9 x 24 mm). This is very important advantage of this model as large sensor lets you to produce pictures of the better quality. The Canon EOS 5DS has more number of focus points than the D750: 61 vs 51. More number of focus points means less risk of losing focus lock while tracking a moving object.
The D750 is equipped with tilting display which will let you to take high quality selfies. The D750 screen is better as it offers more number of screen dots 1,229,000 in compare to 1,040,000 dots of the Canon EOS 5DS screen. The higher dot count screen is better for reviewing images on your camera.
The D750 is produced with built-in flash. The D750 battery life is better than the Canon EOS 5DS battery life. In accordance with CIPA standards the photographer will be able to produce 1230 shots with the D750 and only 700 with the EOS 5DS. The D750 weighs 750g which is 180g lighter than the weight of the Canon EOS 5DS. The D750 can utilize optional accessory GPS devices. Recording GPS data can be convenient if you like to travel, to be able to check the image metadata and see exactly where an image was produced.
Considering the above differences the Nikon D750 will be the best buy. Get the list of the best offers on Amazon