We were there for a week, last week of febuary 2019. We didnt have much snow, but could still snowboard on the groomed pistes. There is a nice town, lots of cafes and most of the trails are connected even when there is no snowfall. The week after we went, the snow all melted though.
Willingen is quieter and smaller than winterberg, meaning you have less waitingtime for the lifts. All in all a good week!