Both look dreadful on paper but I'll go with Arizona.
Look at this team:
Clayton Keller - Nick Schmaltz - Phil Kessel
Lawson Crouse - Barrett Hayton - Christian Fischer
Ryan Dzingel - Johan Larsson - Dmitrij Jaskin
Loui Eriksson - Jay Beagle - Antoine Roussell
Andrew Ladd / Travis Boyd
Jakob Chychrun - Connor Timmins
Shane Ghostisbehere - Ilya Lybushkin
Anton Stralman - Kyle Capobianco
Vladislav Provnolev
Carter Hutton
Josef Korener/Karl Vajmelka
It's pretty awful, however they are properly rebuilding. Could see them being even worse after the TDL once they trade guys like Dzingel, Larsson and Jaskin as rentals or trade Kessel this offseason.
That being said, I really like what they've done this offseason, Buffalo should follow suit.
They've got an excellent prospect pool and 8 picks within the first 2 rounds next year.