A little history...
Ok, my story. I bought my P226 in 1985 while serving on active duty in the US Army (1st SFG(A)). I bought it, long before it was popular. Why? Because the Army had just selected the M9 (basically the Beretta 92FS) as it's new sidearm. I had been trained in the army on the 1911 and was not positively inclined towards the 9mm... Anyway, to my surprise, the Sig was... OUTSTANDING. I kept it. For 23 years, I shot every new major pistol to come out trying to find a better pistol. Colt, Glock, HK, even a few Smiths. You name it, I bought it, I shot it, I sold it. None compared. None came close. Now, I carried the M9 in Bosnia and Iraq, over multiple deployments and several calendar years. I would and did trust my life to it (well, I also carried an M16 or M4 and in Iraq, commanded an M2 Infantry company, nothing like heavy support of the 25mm variety). The M9 is a great pistol! However, I still liked my Sig better... Around 2008, I found the replacement. The first autoloader to surpass my Sig. What was it you ask??? A Springfield Armory XD, 5", 45 ACP with factory trigger upgrade, thumb safety (learned on the 1911 remember) and tritium sights. Now, you wont by CC'ing with this. It is a serious SHTF sidearm. So, my comment to this thread is - both are great pistols. I like the Sig better than the Beretta, but I have carried both, and trusted my life to both, in some areas where Americans were not particularly well liked. However, the best sidearm in the history of the universe, for me, is the XD, in 45 ACP, with a 5" barrel and a trigger job. That said, regardless of the pistol you choose, training to be proficient with what ever weapon you employ is the key, if you're serious about being ready to use it. And, when it comes to accuracy, having a good trigger is what will separate an obscured headshot at 25M from a front plate impact. Hoahh. A side note, I still have the Sig and in fact, just took my 16 year old daughter out and spent the afternoon shooting it with her. She put her first five pistol rounds, ever, in the black at 5M.