You will get a number of different opinions here and on any board you post.
One thought is go BIGGER... carry only a .454
Another is anything is better then nothing....
I have/do carry every thing I own at one time or another, from a small .25 up to my .45.
You should carry what you shoot best and have the most practice with, IMHO.
Your dress may dictate what you can carry, as if you have shorts on it is hard to conceal a SIG P220.
I have a Ruger LCP, LC9 for carry when I can't show much or don't have a bag/case to store a gun in.
My SIG 239 or Ruger SR9c are smaller guns when I have the chance to hide them well.
Theses are just my thoughts and are worth what you're paying for them .
BUT, practice and practice......