What do you guys use ??
Both. 16:9 for video, 4:3 for photos.
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I’m the same as Dave, you can then crop to how you want.
I think you probably have no choice for photos if, as I do, you shoot JPEG+RAW.
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I’ve never shot RAW, I know I should but never have.
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I use 16:9 for both videos and photos.
Mainly because that’s the shape my TV is, it’s not 1980 you know 
But in all seriousness, my learned colleague @RaRaRasputin pointed out to me last year, “Why not use the whole sensor?” - and he has a point…
And now you have me wondering…
I shoot JPG+RAW and I’m 99.9999999999999% sure they’re still a 16:9 format?!
How many pixels x how many pixels?
That’ll be a 4:3 then. 
I was wondering, earlier, why the jpeg is 4000 x 3000 and the RAW is missing 8 pixels each way. 
Yeah, weird!! I stand completely corrected.
Shows how much attention I pay eh? 
All those crisp, sharp, colourful pixels you’ve been ignoring!
You’ll be reported to the RSPCA … Royal Society for Pixel Counting Anomalies.
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