Depends....If the 3* player score goals(striker),or goalkeeper have saves in the match of course he will have big rating(8 or 9).And 5* player if he gets many goals(GK),or doesnt score goals he will have rating(5,6,or7)-depends on the result of the match..And every time the player with bigger rating is better then other one with bad ratings(P.S doesnt depends how much stars he have both)