For damage anyway? From a pvp aspect.
I always have it on passive, and would much rather have it right by me for freedom and sac, rather than wanting to use it and it ran off somewhere. I dont even like using blink strike (while on passive) because it uses it, then its as if it has to attack everyone in the bg. I thought passive meant passive. (as in it would come back after blink strike.)
edit- Im playing MM, I hate BM.