If the foundation stock was unknown I's still likely go with A for the "long term" project as it has further to go down the road to being finished BUT... since we know the source that alters things for me.
A has conformation issues imho. The head seems too small for the body both in terms of proportion and shape. The quality of the shiroji is very nice and the beni/sumi package could eventually finish well, but if the body continues to outrun the head it could become a very odd looking fish at maturity.
B on the other hand has a well proportioned head to body ratio, good looking skin as well, and a well balanced, solid pattern. It may never win any GC trophies, but it could do well in mid-size competitions and would look great in my pond