Class 1A is a loose commercial fit for easy assembly and disassembly.Class 2A is a medium fit.Class 3A is a tight fit used where a closed fit between mating parts is required.
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The allowance is 30% of the class 2A tolerance. For class 3A, the major and pitch diameter maximums are at the basic size. Also, the pitch diameter tolerance for class 3A is 0.0035 inches, which is smaller than the class 2A tolerance of 0.0047 inches.
Class 2A fit has allowance and tolerance.Class 3A fit, however, has only tolerance, creating a tighter fit. The two diagrams below should nicely illustrate allowance and tolerance.
2A will charge the phone faster because it's higher current. Though with higher current you need thicker cable - it's lower resistance, thus all that current will go through nicely. Higher current = battery heat.
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smartphones takes only the power it needs or handles upto. so you wont see any difference between 3A charger and 2A charger if your phone can support upto 5V 2A charging. But if your phone can take 3A of higher, You will find 3A charger faster than 2A charger As it takes more power available to charge the battery.