The reason it is hard to compare their D+1 is because they were different.
Nylander in his Draft+1 was an 18 year-old, the entire season.
Pettersson in his Draft+1 was a 19 year-old for most of the season.
That is really big at that age.
Pettersson played 16 games as an 18-year old in his D+1 year, Nylander played his entire D+1 year has an 18 year-old.
When Nylander was 19, he tore up the AHL and made the NHL down the stretch.
If Nylander was putting up 45 points in 38 games in the AHL and scoring at a 50 point pace in the NHL as a 19 year-old, no doubt in my mind he had the ability to put up monster numbers in the SHL on a good team.
I'd say Nylander had been the more impressive prospect overall. His explosiveness is what probably sets them apart, but who knows how it plays down the road.
Canuck fans should pray that Pettersson has Nylander's impact.