The cant of the pistol helps to hide it when concealed, as the "pointy parts" are more in line with the torso. If you are going to use it for competition, I'd recommend carrying it at around 3 o' clock in whatever orientation is comfortable, safe and reasonably fast.
The Galco guys can probably give you a more professional reason as to why the cant is the way it is. I "cant" (ohhhh holster humor is painful)
*Disclaimer* I'd strongly suggest practicing drawing and reholstering with no ammo in or near the gun for a long time before trying to do it with live ammo. I usually do about 1000 reps with a new holster and gun before ever trying it with live rounds.