After realizing that I feel like I know what you are talking about, but then realizing that I have only met a couple investors in my life, I think you must be talking about something more general. Perhaps personality archetypes. I think our chosen field attracts these two personality types, which I guess you could say map pretty well to "engineer" and "marketing and sales (business)person". I think the third major category would be the slightly more nebulous "designer", or craft-y/sman type, but I don't know if thats as common among investors.