Vengeance: 51 sta (closer to 59 with talents and Blessing of kings) and the 10% procc is nice to have. I would take the darkmoon faire trinket over the commanders badge. The procc is not much but it adds up..
100 extra threat now and then is always nice to have.
Madness is useless (except for stamina) when tanking, would take vengeance over madness any day.