Among the two, my radiatas have always been the more colorful. This is based on a limited sample, as I have only had two radiatas and two antenatas. The radiatas were a bit more colorful as far as consistency goes. The antenatas would look better some days, but they seemed to really react to the tank levels more than the others (maybe this is a good thing, after five or so days when the antenata looked a little less colorful, time for a water change. They were better than any test kit I ever bought).
All four of these fish took some patience, but were not too difficult to start up on frozen foods. Both got to be about the same size in my tanks. Ease of care is like that of any other lion once you get them onto frozen foods.
All in all, you can't go wrong with either fish. Sorry, know that doesn't really help you make a decision, but it's really a toss-up.