It really comes down to personal preference but finding varieties that are juicy, tart and flavorful are the best bet. The most common varieties for lemonade are Eureka and Meyer lemons. Eureka lemons are bright yellow with a tangy flavor that offer the traditional lemonade flavor. Meyer lemons on the other hand are going to be smaller and rounder. These lemons have a sweeter flavor profile and are best for those that prefer a less tart lemonade.