Would you rather write something functionally or imperatively?

gistfile1.scala

import scalaz._
import Scalaz._

case class Score(offline: Int, online: Int)
val scores = List(Score(100, 200), Score(103, 99), Score(12, 0))

// Written functionally:
val (offlineScores, onlineScores) = scores.foldMap(score => (score.offline, score.online))

// Written imperatively:
var workingOfflineScores = 0
var workingOnlineScores = 0
for (score <- scores) {
  workingOfflineScores += score.offline
  workingOnlineScores += score.online
}