1 hole, that probably accounts for green presses need to 'cam over', while Lee all have a stop built into the press linkage.
Lee advertised the aluminum alloy they used was 46,000 psi tensile strength. I looked in my Machinery Handbook for cast iron tensile strength and most were less than 30,000psi.
Cast iron is great for machines with fast moving parts and need the mass of metal to dampen any vibrations. World of difference between a Delta or Powermatic table saw and an aluminum table saw you can carry.
But even Lee had to accept the 'Conventional Wisdom' that cast iron is better to make a press out of. Even if it isn't....LOL