Found a great article about choosing a Legion. This is one of the best articles I’ve come across in regard to the DA/SA or SAO debate.
WHICH LEGION SHOULD I GET: DA/SA OR SAO
For single action firearm enthusiasts Sig created the full size P226 SAO Legion. With many of the same features as the P226 DA/SA version Legion, the SAO includes an enhanced action with Master Shop Flat short reset trigger. The trigger pull comes in at 5.0lbs and measures just a bit longer and a tad bit heavier than the DA/SA version at 8.2″ (208mm) overall and .4oz (9g) heavier.
You can still find all the premier features the Legion series of firearms are known for, such as the Legion Gray PVD finish, reduced and contoured elite beavertail, enhanced checkering on front strap and under the frame relieved trigger guard, solid steel guide rod, and custom high checkered G-10 grips with Legion emblem. Shooters will still find X-RAY Day/Night Sights on this Legion as well as a picatinny rail for whatever accessory the shooter prefers.
The SAO only comes chambered in 9mm with a 15rd capacity. It still includes three magazines and will come with a special Legion series soft case and challenge coin after the serial number is registered with Sig.