They will both make the same power, but it's a personal preference decision based off of the sound you want your car to make. The X pipe typically has the more exotic sound and is what NASCAR uses. The H pipe has a deeper tone at idle and during part throttle acceleration.
We do have power packages available that include both the SCT programmer with custom tune and either the X or H pipe and they are both $699.99 shipped. Hope that helps, let us know if you have any other questions.