I picked 5-shot revolver, but having a single option for choice doesn't allow for me to also choose single stack pistol.
My most often chose retirement weapons are either a 5-shot snub or a single stack .380, 9 or .45, depending on clothing choices, weather, planned activities, etc.
I choose the gun/caliber for how well it fits my planned activities, as well as my daily risk assessment ... and sometimes simply my whim. All of them have seen their fair share of range time being used for quals, training/drills and general practice while I worked as a firearms instructor.