When the Bible talks about people, it cares about numbers, because each number is a soul.
Multiplication, as possible, is always preferred, because more souls are getting connected to Jesus. The differences between Addition and Multiplication could be compared to the old saying of “give a man a fish, he’ll eat for a day; teach a man to fish, he’ll eat for a lifetime.” If we simply teach people about Jesus, they will be saved, and that’s amazing. If we teach them the full workings of Jesus and the life He invites us into, they will naturally share this good news with others, who will share it with others, causing a multiplication affect.