My favourite was actually a loss! But there is a reason. My first away game was in the 1996/1997 season and it was the 3-1 loss too the scum at the old cesspit library. It was cold and pissing down with rain. The match itself was a bit shit, but as a new fan the level and quality of support I was experiencing that day was second to none and so the day is still one of fondness for me.
That said, I have never been to a winning NLD, especially not away. All my others have been draws or losses and at WHL. I suspect there will be a game out there in the future willing to take it's place.