Antoine Vermette will be a 40-60 point player who thrives on offense while Veilleux will be a 25-40 point player who plays a better defensive game.
Vermette has a lot more upside. I would take Vermette.
While I agree on most things, I would like to add that Vermette's defensive game is at least as good as Veilleux's. I don't know what to say about Vermette's defensive game other than he was so good defensively and on the PK that the club couldn't help but put him in the line-up time after time even if they had originally planned for him to play in the AHL last year. Only Peter Schaeffer was better on the PK last year in my opinion (considering Fisher was hurt most of the year).
Vermette can be a great player in the NHL. He's improved his defense a lot since his junior days, and has the potential, IMO, to get 60-70 points in a good season. He's young and such a good skater that there's now way he can be compared to Steph Veilleux, who's more of a defensive player who can't score. Doesn't get great stats in the AHL if my memory's good. But Veilleux will fit perfectly on the Wild's third line in 2 years.