To each his own, I carry a SW 1911PD daily and in my experience, the S&W's are just not really particular to what they are fed and seem to function with a variety of aftermarket mags. Mine likes ACT, Wilson, Chip Mc and Nighthawk mags just fine. Never hiccuped except with 45+P and a recoil spring change fixed that as well.
The DK has a flat trigger which takes some getting used to "for me anyways" but is a really good shooter. Had one in 45. Wish I still did. The S&W will take most aftermarket access. such as mainspring housings, guide rods, triggers etc. just as the STI and it has a lifetime warranty.
Only shot STI's a few times, likes them, but not as much as my Smith's