There is little difference between the two, the power is close, both are fast charging, and can not reach the flash charging level. Mobile phone charger 30W fast charge parameter is 5V6a5x6=30W. The 33W fast charge parameter is 5V6.6a5x6.6=33W. There are two general directions to improve the charging speed:
One is to increase the voltage, the second is to increase the current. Increasing the voltage will increase the heat generated during charging, accelerate battery aging and may bring safety risks, so the actual effect is not good. By contrast, raising the current is more realistic.
It must be 33! It charges faster, because its power is ten percent faster than the 30 watt charger! As for the quick charge flash charge is just a name! The more power, the faster!