CHD for the sex appeal.
Once the sex appeal is gone and its just any ordinary dagger to you, switch it up and get a Dv +8!
Its like in Modern warfare 2. The m16 is my main gun, but every now and then when im getting wrecked, I switch to the famas which is practically the same and dominate.
Then switch it back when im getting owned haha.
Just makes the game more "interesting" as having fun is the only thing important, and fun is all in the head =D
Hope that makes sense