As someone who would have preferred Benson at that spot (then and now), the case for Willander is one based on asset value, not ultimate upside.
Benson's 99th percentile outcome is Martin St. Louis. Willander's equivalent is closer to right-handed Jacob Slavvin.
However, Willander's 90th percentile outcome is a guy like Brandon Carlo. Benson's is more like Nicolas Aube-Kubel or Eeli Tolvanen. IE, essentially worthless.
I still prefer Benson - he had some wild, Pettersson-esque statistical dominance in his draft year. I think he'll be a superstar. Funnily enough, I was on the other side of this argument in 2022 - I did not think Lekkerimaki was likely to hit his highest projections, and would rather have gone for the all-around D that was available: Pickering. I still believe that.