i believe there are times to show you are armed and there are times where it is best to slip under the radar. i carry bigger choppers alot. one of the reasons i want to carry the three on my left is so when i hav my glock on my right i have a back up in case i am involved in a gun grqb. one hand fights to keep the gun in the holster or pointed away from me while my left draws the three to help end the fight fast.
then when glock is left at home then the three moves to the right for main weapons position.