Remember these are used for matching color by sight.
REC 1886 would be what you use to use with CRT monitor or if you where producing for SD television. Some people will use it for stylized or nostalgic work.
REC 2020 is for high end monitor…or newer monitors and theater projectors. Like P3 if your monitor supports it, it can show more colors on that monitor. The problem is that when viewed by people who’s device that doesn’t have that or you save in a file format has the extra color info then the colors get shifted.
sRGB is the most common and compatible. That’s why people mostly stick with it.
