I mean, Wahlstrom is listed heavier than Zadina, though I could've sworn Zadina was an inch or two shorter. Zadina is slow and disappears for huge chunks of a game, while Wahlstrom stays engaged. I think Wahlstrom is the better playmaker and the better all-around offensive player and play-driver, while their shots might be relatively even. Zadina lacks an extra gear, and can't really create plays of his own I find. Track record is... whatever. Zadina has been known for longer because he's a year older, and late birthdays tend to get noticed earlier because they're playing with older age groups than the regular birthdays.