John K Jordan
A platter with a fairly flat bottom can show off more of the figure.
Be aware that some crotches are a disappointment when opened if they have bark inclusions or rot. There are sometimes hints of this on the outside.
Most people cut exactly right down the center and get two blanks. Another way only gives one blank but could possibly give better figure since the process of mounting and turning usually cuts away a some of the best figure at the center - by sawing a little to the side of the plane of the three piths can give a little extra wood for holding and design flexibility. But somewhat like trying to decide on how to cut up a burl all this is a bit of a gamble.
(And I'm not ready to call it a "branch union"!)