Personally I use RGB on anything that natively supports it, with some composite use on games that make heavy use of dithering.(mainly PSX games like pic related, these look better with composite video)
Not sure what you're getting at with implied detail, if anything black levels are better on RGB. The only difference between these standards is noise and color bleeding muddying the image, which dithering makes use of for transparency effects or extra colors. Judge preferred video output methods on a case-by-case basis.