I dont carry, but I would imagine the design of the bullet chosen would depend on the size and weight of the firearms, length of barrel, ect.
For my G19, I almost always keep 147 grain Ranger T in it, and when I dont have a good supply of it or am out, I use 147 grain Gold Dots. If im out of both then I use WWB JHP 147 grain bullets.
Some people like lighter and fast bullets with smaller guns, becuase most believe the high velocity of the bullet will increase its chance of expanding. However, most new designed heavy weight bullets (147, 180, and 230 grain) will expand in short barrels, since they were designed to expand at lower velocities, and from what ive seen, the velocity lost from going from a long barrel to a short barrel is less with the 147 grain bullets, so if it works well through a long barrel, chances are it will work well in a shorter one.
Some like medium and medium or heavy and slow for short barrels. All have their pros and cons, but overall, I will almost always want a 147 grain bullet for my 9mm.