I choose both options, and both have the same results... Black and white text. But on the page you sent me, i is noted that the composite port was intended to be B&W only. Maybe that's the explanation, except if anyone can see colors there.
When I plugged it to the Mac II display, I could see the white on blue screen, sure the display was not in correct sync (flashing) but the colors were there.
by the way, my TV has composite, component and HDMI inputs, no SCART.