Getting a new ball can be a daunting task with all of the available options. A qualified and trusted pro shop operator is the best resource when it comes to ball selection. There is more to ball selection than just polished versus matte.
Current arsenal is as important as anything else. You want a ball a little stronger, well that means something different if you want something stronger than a Tropical Heat or something stronger than a Marvel S.
It can also mean something different if you know WHY your ball isn't hooking enough. Is it burning up, is it not reacting enough, are you targeting the wrong part of the lane for the ball you have. In other words, are you throwing polished pearls in the oil or throwing dull balls into the dry.
I feel adjusting the coverstock is a more reactive move instead of a proactive move. Pick the correct ball for the task then adjust the coverstock to tweak the reaction to meet specific needs. The ball won't always react the way we want and adjusting the coverstock is the quickest, easiest and perhaps the most effective way of achieving the results you desire, but only after picking the correct ball first.