I played with S/D a little but did not find it to my liking. I’ll admit that flanking strike is a nice evasive attack, but I personally just had a hard time getting a feel for the tactical side of this build.
I personally prefer Pistol/Dagger and Dagger/Pistol, they are lower damage but very tactically defensive builds (best for 1v1). I’ll also occasionally mix it to D/D and P/P if I want to focus on burst damage in big groups (mainly to avoid getting stepped on).