I trust the stock 360 crank more than I would the others. I do push mine pretty hard and know one day what could happen. now I don't know who made the early mopar cranks but they are pretty strong for what they are.
I had looked into this ~15 yrs ago, and the 360 crank allegedly came from 2 suppliers. IIRC the one reputed to be a bit stronger was marked CFD, for Central Foundry Division from the General. Not sure if the other was in-house or not, but still strong.