I think completion between teams can often be beneficial as long as that completion is healthy and friendly. The key I believe in staying away from negative completion is strong communication and collaboration between departments. A closer knit work environment is less likely to develop unhealthy negative completion than when departments have little to no contact with members of other departments. Effective collaboration between functional managers can also help keep strong communication between teams and periodic meetings to discuss each departments status can be very beneficial for all members of each department.