This mission allows us to select between Jack and Big Bull as a playable character. While Jack would be a natural choice since we're used to his movesets by now, Big Bull is definitely the clear choice here. The reason is simply his movesets can deal with these particular enemies much quicker than Jack's. (http://www.gamezone.com/originals/2013/01/08/anarchy-reigns-video-walkthrough-main-mission-target-sighted)