Robusta is commonly associated with Coffea canephora and appears in instant coffee, commercial blends and some espresso formulations. It generally differs from Arabica in growing characteristics and caffeine content, but those differences should not be turned into an automatic verdict about every product.
The source highlights the use of Robusta in espresso blends for a particular combination of body and crema. A blend can be designed around those goals rather than around a promise that the highest Arabica percentage is always best. The quality of the component coffee and the intended drink still matter.
Read the blend description and ask what the roaster is aiming for. If you normally drink coffee with milk, compare that finished drink as well as an unadorned espresso. Avoid treating crema volume as a complete measure of taste, and do not infer a precise caffeine dose from species alone. A useful evaluation describes the specific blend's bitterness, texture and finish in the context where you will actually use it.
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