Personal preference very much comes into the concept of what looks better or nicer or has greater aesthetic value. Realizing it is subjective, above you see two Concord chimera African violets. Which would you prefer in your collection? My answer and preference is outside any subjective perspective which is neither right or wrong. It is based on what did the original Concord look like? As I propagate the Concord and as any of the other folks doing the same will note from time to time variations in color and or pattern. Some will take note and discard those variances while others will ignore the differences and sell the plant. As that plant is propagated the variant is accepted as the original plant. Now look at the plants below. Below, plant A, is not the one that most closely reflects the original Concord. Small white margins and almost no white margins at the bottom of the bloom. Plant A has found its way to the compost pile.