The type of profile that you choose will depend on your playing style and the conditions that you are likely to face. If you are an attacking batsmen who wants to hit the ball out of the park, then you may want to choose a curved or scalloped profile.
If you are a more defensive batsmen who wants to protect your wicket, then you may want to choose a straight profile. And if you are a fast bowler who wants to generate as much pace as possible, then you may want to choose a hollow profile.