Some(Int) vs just Int

Users.scala

// implementation 1
object Users {
  var users: Seq[User] = Seq()

  def delete(id: Long) : Option[Int] = {
    val originalSize = users.length
    this.users = users.filterNot(_.id == id)
    Some(originalSize - users.length)
  }
}
// implementation 2
object Users {
  var users: Seq[User] = Seq()

  def delete(id: Long) : Int = {
    val originalSize = users.length
    this.users = users.filterNot(_.id == id)
    originalSize - users.length
  }
}