The two species are almost indistinguishable and husbandry essentially identical. I think the Randalls males are slightly more attractive, though don't expect them to look in person like so many of the photos. They both seem suceptible to body ulcerations which can decimate a newly acquired group. If arrived healthy, frequent feedings in QT with smaller fare works pretty well. They need to get to about 2" in order that they'll compete sucessfully for food in the display if you keep larger, aggressive fish like tangs.