Charlest is correct, this question is dependent on many things like he listed. To give a generic answer from what i have seen:
*Mind you i have no clue what ball you are talking about, this might be different for many balls*
4000 dull is a very fine finish, which will allow the ball to clear the heads very easily and use most of its hook in the backend. 500 Polished is gonna read the lanes earlier even tho it is polished. The 500 grit is very strong and is going to cut through the oil whether it is polished or not, the polish is just gonna help it have a little more pop in the backend.
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