Norris RX versus Johnson 380

Hi there, so here is the situation, I have two spare camshaft one Norris RX and one Johnson 380,and two more engine to build one 850 and one 750 , both dedicated to hot street and track days , what will be the best choice, as they seem pretty close but differs slightly on duration..........??????????

Rule of thumb, the 850 should handle the longer duration cam better.
Cash