Scoundrel Days is much more dark in its sound and lyrical content than Hunting High and Low. It doesn't have a runaway hit like "Take on Me," which is more than half the reason Scoundrel Days is generally less popular than Hunting High and Low.
Even though it doesn't have a major hit (songs from this album did make their way onto the charts, but not even close to the way "Take on Me" did), it's still an enjoyable album. "I've Been Losing You," is the best song on the album, but "Manhattan Skyline" is the song that best foreshadows what future a-ha releases would sound like. Oh, and for some reason I can't stand "We're Looking for the Whales." So yeah, that takes a couple points off.