The S&W was better out of the box than the SA.
This is the big difference between the P220, and the many flavors of 1911's out there these days, especially since Colt is basically out of the picture.
I have yet to have a SIG not work 100% out of the box, and with any ammo I've fed it. The last 4 out of 5 1911's, a Kimber and three Springfields, all had issues that required some sort of work, and some were still finicky, even when supposedly fixed. I never had this trouble with any of my Colts, which, except for one Springfield I have that works, are the only 1911's I kept when I went over to SIG for my carry pistols.
With the SIG's, you may sometimes pay a little more,(depending on what your comparing it to) but you get a features loaded pistol that requires no work out of the box, and as it should be. Nothing is more frustrating than buying a new pistol, especially one thats more expensive and supposed to have all the bells and whistles, and its got problems out of the box and you cant trust it.
The age old argument about the DA vs. SA vs. anything for that matter, at least in my opinion, is crap. If you've taken a little time to learn to shoot what you have in your hand, there is really no difference. I shoot SA, DA, and DAO, and see very little, if any difference in my hits on target. There is a learning curve, as there is for anything, but if you take a little time to learn each type of action, you will have no trouble with any of them. If your a revolver shooter, and learned to shoot them DA, your already ahead of the curve, and you will have no troubles with any DA/DAO auto. If all you shoot is a 1911 and thumb cock your revolvers, you will have some troubles at first.
We all have our favorites, and you should always choose what works best for you, you'd be foolish if you didnt, but just because you cant work something, doesnt mean its the weapons fault, and I can pretty much guarantee that its not, if the weapon fits you and is functioning properly.
I still say get both. If you have one, get the other, you may fool yourself and find a new love, or you may confirm what you already know. You'll never know if you dont try. You never know, you may be missing out on the best thing since sliced light bread.