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These are two different types of outside linebackers, but they both belong in the discussion for the top 3-4 and 4-3 outside linebackers in the league, respectively. There isn't much that Lance Briggs and James Harrison can't do for their teams.
Over the course of their careers, they have combined to make 12 Pro Bowls and be voted onto seven All-Pro teams, making them two of the most decorated linebackers in the NFL. They are also two of the better competitors and the NFL, and even though Harrison has been labeled "dirty" in recent years, you cannot doubt his passion for the game.
Neither Briggs nor Harrison appear ready to give up their spot on the Pro Bowl roster or the All-Pro team anytime soon, and they should continue to dominate the NFL for the next few years.