The sigma has been replaced by the SD9VE, the price is the same as the old sigma's at places like Academy. The SD has a lighter trigger than the sigma as well as a few other minor changes.
By virtue of far superior ergonomics, I vote for the SD.
Both these guns are a huge bang for the buck, I'd be happy to own either.
SD, no hype, kooi-aid, marketing expenses or extra backstraps to pay for, just American perfection!