I carried a Sig P-226 on duty for over 7 years. They are a very fine pistol. Whover designed the grip, trigger, controls of the P226 had a hand identical to mine. It is the most natural pointing, great shooting pistol I have ever handled, period.
With that said, the only drawback of the P226, especially on the non-stainless slide versions, is they wear much faster than a Glock. After 2 1/2 years, my P226's finish was badly worn. This was way back, so the great number of finishes were not available, and the P226 was not nearly as common. I sent it to Accurate Plating and Weaponry. They really screwed the pistol up. I had it hard chromed, and the frame anodized. The grip screws were stripped out, and some of the internal parts were bent to the point the pistol would only work on double action-a one shot wonder. I have carried a Glock 22 now for over 6 years. I am so accustomed to the Glock, and using trigger reset, that I would be afraid to go back to the Sig. I really prefer the feel of the Sig, but I will trade the durability and sheer speed of the Glock over feel. This could be a problem for you as well. Both are exceptional pistols. Both go Boom. I have seen two P226's go Kaboom. Usually it is due to using reloads or cheap ammo. One was using Norinco 9mm ball, the other Alabama Ammo remanufactured ammo. Most of the Glock stories are using reloads, or lead bullets. The book says do not. So if your pistol blows up doing what they say, don't be suprised.
BTW-ever heard of any other pistol having over a million rounds through it and still shooting to spec? I personally have shot a G18 (FA) at Smyrna that had over 750,000 rounds through it. It worked flawlessly. When it got hot, we just locked the slide closed, dunked it in an ammo can of water to cool it off. Your Glock works, you are used to it, you have built up confidence in it from use. Why go to another operating system that will take you awhile to learn?