The difference in taste I notice in general with color variations of the same pepper is the yellow ones are more citrus, or Pineapple (7 Pod Yellow), and the like. The red ones tend to be hotter and with a more berry flavor and the brown.black, dark red ones tend, on average to be the hottest with less fruitiness and more heat. That is the pattern I notice the most. Sometimes the dark ones are so strong, they are better powdered or blended. It is like beer, to red wine, to whiskey. If that makes sense.