The 5A data cable supports a larger current than the 2A data cable, such as the green 5A data cable, which supports Huawei SuperCharge. With the 5A charger, Huawei P20 can be fully charged in about 90 minutes (you need the phone to support the corresponding fast charging technology to reach the fast charging speed).
Another example is the green Link 2A data cable, support QC, Huawei FCP and other fast charging technology, with QC charger, about 100 minutes full of Samsung S7. Recommendations can be understood in many ways.