The superior lather catcher head doesn't angle down as much as the gem. That could be due to damage over time on my example. But it doesn't look like it. Another difference is the guard. The superior guard is more squared off and comes up higher. So in theory the superior should give a different shave feel. I'll try it out tonight. Gem left and superior right.
https://flic.kr/p/2iHz8xw
https://flic.kr/p/2iHz8xw