It is most common to find a P226 in the standard DA/SA mode. If you go to Sigs site, it lists the trigger pull weights, and that should be pretty accurate. After a little break in the DA tends to be pretty smooth, so don't take the higher pull weight numbers to be that bad.
There is also a DAK configuration, which attempts to give the same longer DA-styled pull for all shots. It's default pull weight is lower than the DA/SA model, but feels much different. You'll need to try one out to see if you like it.