Why crop in camera when it is easy to crop in whatever software is used in computer. I would suggest the later cropping is done is better....
It depends on how it is done. I recall reading that (some? all?) Sony cameras offering APS-C output sample only the APS-C image area which, because of the smaller data output enables greater frame rate, whereas where Canon does this the whole sensor is used for the image and the image is cropped in the processor and as a result the frame rate cannot increase because the same amount of data is leaving the sensor. So you are correct in as much Canon makes no difference if you do it during capture or post capture, but the Sony implementation offers advantages.
HOWEVER, if Canon can follow Sony's lead they will have the same advantages as Sony.
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