In a real quick and dirty comparison of my duo-r and the LA on the commodore 1702, I definitely prefer the duo-r's composite. On the same cables the duo-r has less ghosting, and the colors are slightly more subdued, which is good because on the LA the bright reds seem to bleed slightly. The differences are nearly indistinguishable without looking closely though. *shrug*
The 1702 definitely handles the LA composite signal better than the LCD... but then again, that kind of points to a flaw in the LA that the duo-r doesn't have, because I don't get the same problems on the LCD when I use the duo-r.