I mostly use RGB because it is often faster than switching to HSB and also it can be copied and tweaked in the code. While I did wrap my head around RGB years ago, this is a very nice read to think about what you are doing.

A very interesting project, however I wish all logos would be shown with colors and including the tag lines. I currently have the feeling they went a little overboard with simplifying so that the logos feel fairly generic and hard to recognise.