why would I choose a slightly lower resolution ? (3264x2448 instead of 3648x2736)
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On a Huawei P20 Pro I can choose, among other resolutions, either 3648x2736 or 3264x2448 for a photo. The 3648x2736 matches the camera default recommended resolution, which in fact is 40Mpix/4 of the Quad Bayer.
Question: what would be the reason on choosing 3264x2448 resolution? Where do these values come from?
By comparing the result, the overall shooting angle appears to be the same on both resolutions, so the 3264x2448 does not seem to be just a crop of a 3648x2736 image.
The values are whatever resolutions the device reports that it supports. In general devices tend to offer a range of resolutions even at the same aspect ratio - e.g. if someone wants to shoot at lower resolution. So I guess Huawei decided to offer an ~8MP resolution as well as ~10MP.