What is the difference in Trickle-Charging a Car Battery at 2 Amps, 4 Amps, and 6 Amps?

I am trying to rotate the three different Amperages. My Charger just indicated "75" Full on 6 Amps, so i switched it to 2 Amp Charge, what are the differences and benefits for the battery at these charge rates?
 
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