Arabica and Robusta are two of the most popular varieties of coffee beans. Arabica beans are grown at higher altitudes and have a milder flavour, while Robusta beans grow at lower altitudes and possess a stronger, more pungent taste.

Arabica is usually considered to be the superior variety in terms of both quality and flavour, as it has sweeter notes with less acidity than Robusta. However, Robusta does have an intense bitterness that many find desirable for espresso blends.

Additionally, because of its higher caffeine content (about double that of Arabica), Robusta creates a thicker crema when brewed as espresso which gives it a strong aroma. While both types can be used for specialty coffee drinks like cappuccinos and flat whites, Arabica is typically preferred due to its smoother flavour profile.