Taste:The taste profile of the Robusta bean is generally described as "burnt tires or rubbery". One of the reasons is because Robusta has more caffeine, which carries a bitter taste. Arabica has 60% more lipids and almost twice the concentration of sugar. This is the factor that has the biggest impact on why Arabica is prefered. Physical attributes:Arabica plants grow between 2.5-4.5 meters, while Robusta reach a height of 4.5-6 meters. Robusta beans are much more circular, whereas Arabica are more oval.