You don't want a Sig DAO unless you plan on buying parts and converting it. The DAK isn't much better.
If I bought either one of them I would convert them to DA/SA.
You would need the following:
Hammer
Hammer Strut Pin
Decocking Lever
Decocking Lever Spring
Decocking Lever Bearing
You would also have to cut a notch in the grip for the parts change.
I have converted SIGs a couple of times. Last set of parts I bought were about $175 20 years ago. I'm guessing the parts now would cost $200 or more.
I noticed on eBay someone was selling a used DAK to DA/Sa kit for $160.
https://www.ebay.com/itm/Sig-Sauer-P...EAAOSwMutc~BJh