JtheNinja

The color space setting on your camera is for the JPEG output, it does not affect raw files. Raw files are by nature in the cameras native color space, and will be converted by your raw processor first into whatever working space it has (often linear ProPhoto, or occasionally linear Rec2020), then converted at output time to the color space you specify (usually sRGB). While you’re editing, your software’s color management will show you the file converted to your display’s native color space, assuming you have a measured color profile loaded properly.

While modern browsers are usually pretty good at converting color space tagged images to the display’s color space, a lot of websites will strip the color space data from files you upload. It’s difficult to rely on the color space data actually making it to your viewers, so it’s usually a good practice to just use sRGB for web. This may reduce the color somewhat from what you see on your monitor, use soft proofing tools to check what it will look like once downconverted to sRGB.

HEIF, for the more efficient compression if nothing else. Although I believe iPhone JPEGs also lack the HDR gain map that HEIF has, but not 100% sure on that one.