I have been snowboarding for about 14 years, so take this as you will. However...
In general, having your feet pointing somewhat in the direction in which you are going, will make it easier for you to go in that direction, especially your front foot. Taking this example to extremes, if you had both your feet parallel next to each other facing forwards, (coming from skiing), it would be very easy to make turns. Many people say skiing has no relation to snowboarding... but they both have two edges, so the concept of using the edge and shifting your body weight to initiate a turn is the same.
For this reason, if we take a duck stance, your front foot can be either left or right, and it makes it easier to progress or land in the direction your feet are pointing.
I personally ride +17/ -9, because I usually ride normally, therefore having a bias on my regular front foot, but I occasionally ride switch, so having my back foot at -9 helps me then especially with landings.
Since you ask, compared to a 0/0 stance... I think a 0/0 stance would be the easiest to catch an edge on during normal riding. And maybe not so good for the knees in respect to lateral side to side movement. ( I have a bad knee, so maybe me more than others)
But as most people will tell you, stance is a personal preference. In general, if you don't ride switch, have both your feet facing foward. If you do ride switch have your back foot at at least 0 or anywhere minus from that (but not more than your other foot)