Use arabica or robusta coffee beans to make cold brew concentrate, but deciding which one to use is a matter of preference, so let's look at how they compare. Arabica beans from the Coffea arabica plant generally have a smoother and more complex flavor profile with subtle floral and fruity notes. Cold brew made with Arabica beans tends to be mild and less bitter, making it a popular choice for those who prefer a smoother, delicate flavor profile. On the other hand, robusta beans are known for their strong, robust flavor and higher caffeine content. Cold brews made with robusta beans can be more intense, appealing to those who prefer a strong coffee in the morning. To achieve a coffee with a milder taste, you can opt for arabica beans. If you like a strong, more caffeinated cold brew, robusta beans are the beans for you.