Speaking just for myself.. As Joe Citizen, I never really considered capasity a big issue when selecting a firearm. I bought what suited me, what fit my hand best and what I felt I could be proficient with. I have carried a Jframe Model 36 6 shot 38special more often than anything else. When I dont carry a revolver, I carry a sig P239 8-shot 9mm. I have never felt underpowered and I am certainly better off having 6-8 shots rather than zero.
With a fire extinguisher I went the exact opposite. I got the biggest baddest sucker I could find.
Life is a web woven by necessity and chance...