Sampling from laptop to MPC

Is there any sizeable difference in quality if I use the sampling feature on the MPC to sample my drums from the laptop live VS if I use a CF card to load the .wavs to the mpc?

Also, on a related note, when I'm chopping drums I sometimes don't know if I should chop out the "air" in the drum, what do you guys think it's the best approach?
 
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