The DAK trigger is a Glock like trigger, not the same by any means but that is as easy a way to explain it as any. It is preferable to a straight DA trigger which is also available, at a lower cost. The DAK has a different trigger reset compared to the DA as well as a lighter not as stacky pull. DAK is a DA style same pull every pull trigger though. The DA/SA with a decocker has a learning curve of two distinctly different pulls on the trigger. The decocker also requires a deliberate action to safe the pistol whereas DAK or DA only require a release of trigger to return weapon to a safe condition.
Spending several hundred rounds at the range using a DA/SA as a DA by decocking every shot will easily train one to decock as well as train on the tougher trigger pull. Many more knowledgeable shooters than I prefer the DAK to all other triggers. I have never shot one, only dry fire. You may want to try a P250 as it has a trigger feel all it's own, a long rather light smooth pulling DA.
Something that Sig also has available is a short trigger for most models, which can really make a difference for people with short fingers. A P239 is a good suggestion it is a single stacked mag, with a nice narrow grip like a 1911. It is all metal so it soaks up recoil nicely, but is a smaller size gun somewhere between a G19 and the baby Glock. Yep a SAS P239 in 9mm with the DAK trigger (SAS is the dehorned wood grip model) that would be my rec'y to try next.
All the Sig triggers are reliable, generally speaking they are smooth and get better with use.