I started riding in the 0/0 days, and used that for a while. I soon transitioned to pushing the front foot forward to about 12 and used 12/0 for around 10 years because I felt more stable that way and felt I had more control. But it always felt a little awkward as being somewhat of an unnatural stance.
A few years ago I pushed the back foot to -6 and really liked it. I started riding switch this season and pushed the back foot to -12. So my current setup is 15/-12 and that really feels ideal for me.
But regardless of natural feel, I do think there are meaningful advantages to an angled setup (not necessarily duck, but using any angles). From a physics standpoint, you have more stability if your feet are angled. By the same token, you have more control. This is because your feet are responsive to, and can act in, two dimensions instead of one.
Take a look at this highly technical computer-aided drawing:
Clearly, the structure on the left (analogous to a 0/0 stance) is more susceptible to instability from a transverse force as shown since each foot only acts in one dimension in the plane of the board (generally speaking, along the axis of the board width via toe and heel pressure). On the other hand, the structure on the right (analogous to a duck stance) utilizes its trapezoidal shape to allow each foot to operate in two dimensions (both the width and the length of the board) and accordingly has more stability (think truss versus rectangle in building a bridge). Outputs from the feet in this position are similarly advantageous since they act in two dimensions. This useful when thinking about shifting weight fore and aft.
Of course this concept isn't exclusive to the duck stance. The idea is that stability increases with binding angle, wherever that angle is. Comfort, natural feel, and intended purpose are all other factors that play into how you'd set up your bindings.