I carried a Kahr K9 as my CCW for a number of years and felt that it was sufficient. I now carry an HK P2000 .40 or Glock 19 99% of the time because I found it wasn't a big deal to conceal the larger gun and more capability could be beneficial. Situations like the Trolley Square mall shooting in Utah made me rethink my selection (the off duty officer who initially engaged the shooter had a 1911 and no reload). I now carry as much fighting capacity as is reasonable for me and my situation. There may be situations where I need to carry something smaller and I will vary what I carry. For you or someone else a single stack 9mm might be fine but at the moment I choose to carry more.
I once saw a quote (attributed to someone smarter and more experienced than I) the basically said that they never heard of someone in a gunfight who thought they had too much ammo.
(All that said, I'm looking to buy a M&P Shield 9 to use in certain situations)
Edit: to specifically answer the original question - I would not choose a single stack handgun as my sidearm for going into battle. If more rounds are readily available with minimal size penalty, I'll take more rounds.
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