Well I'm not going to vote. And I'm not going to get into the whole argument of why this thread is or isn't silly. But I'm posting. Because I think this will be genuinely interesting to see how these two players pan out...
Both appear to be very creative playmakers and elusive skaters. But differ...
In Barzal, you have a skater with an exceptionally strong lower body that he uses to routinely out-muscles bigger players. Has great shot, but rarely uses (or even consider using it) first. Additionally, most Isles fans would say that his puck possession (exiting the d-zone, controlling the neutral and going the o-zone at will) is his greatest attribute.
In Pettersson, you have a player with a great shot and already knows how to use that shot. From what I've seen, his leg strength is not comparable to Barzal yet. I haven't seen enough to know how he is with carrying the puck to compare to Barzal.
Regardless, Isles and Nucks fans can agree that both players will be better than Matthews AND Tavares every day of the week, and twice on Sunday with regards to Tavares.