Concealing a 3.4 inch barrel weapon versus 4+ inch barrel, does it make a huge difference?

I am considering the Ruger SR9C Compact with a 3.4” Barrel, a Ruger Security 9 with a 4” barrel, and a S&W M&P 40 with a 4.25” barrel. I am 22 5’10” 145 pounds and in the process of receiving my concealed carry license in Colorado. What do you guys think? Thanks via /r/CCW https://ift.tt/2DLBLkB