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Main
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SENSOR Effective pixels: 22 megapixels
SENSOR Max resolution: 5760 x 3840
SENSOR Sensor photo detectors: 23 megapixels
IMAGE ISO: Auto, 100 - 25600 in 1/3 stops, plus 50, 51200, 102400 as option
IMAGE Boosted ISO (maximum): 102400
PHOTOGRAPHY FEATURES Continuous drive: 6.0 fps
SCREEN / VIEWFINDER Screen size: 3.2″
SCREEN / VIEWFINDER Screen dots: 1,040,000
SCREEN / VIEWFINDER Live view: Yes
VIDEOGRAPHY FEATURES Microphone: Mono
OPTICS & FOCUS Number of focus points: 61
PHYSICAL Battery Life (CIPA): 950
CONNECTIVITY HDMI: Yes (HDMI mini)
OTHER FEATURES GPS: Optional
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PHYSICAL Weight (inc. batteries): 895 g (1.97 lb / 31.57 oz)
Summary
The Canon EOS 5D Mark III maximum resolution of 5760 x 3840 pixels (22 megapixels) is better than the Canon EOS 5D highest resolution of 4368 x 2912 pixels (13 megapixels). The Canon EOS 5D Mark III offers a wider ISO range of 100-25600 in compare with 100-1600 ISO range of the Canon EOS 5D. Such ISO numbers let the camera owner to shoot good quality photos in low light situations. The Canon EOS 5D Mark III has more number of focus points in compare with the Canon EOS 5D: 61 vs 9. More number of focus points means less risk of losing focus lock when tracking a moving object.
The Canon EOS 5D Mark III screen is better as it has more number of screen dots 1,040,000 in compare to 230,000 dots of the Canon EOS 5D screen. The higher dot count screen is better for reviewing photos on your camera. The Canon EOS 5D Mark III supports a very convenient live view function which allows you to use the display as a bigger viewfinder.
The Canon EOS 5D Mark III battery life is better than the Canon EOS 5D battery life. According to CIPA standards you will be able to capture 950 photos with the EOS 5D Mark III and only 400 with the EOS 5D. The EOS 5D weighs 895g which is 55g less than the weight of the Canon EOS 5D Mark III. The Canon EOS 5D Mark III can utilize optional accessory GPS devices. Recording GPS data can be convenient if you like to travel, to be able to check the photo metadata and see exactly where an image was taken.
Considering the above differences the Canon EOS 5D Mark III will be the best choice. Check the list of the best offers on Amazon