In total agreement,, especially if you can get in behind the enemy as they just think it is friendly fire.
As far as a preference,,, for me it tends to be how I feel and my internet connection,,, some nights I have to use the shotie because it seems the other guns aren't registering, or things are just too jumpy,,, I am still trying to figure out if it is something running in the back ground on my PC or my ISP,, most times it is High Choke and Loss.