okay i will answer to that:
warbringer adds 2% chance to get 1 wdm off:
vizjuns ball bearing adds 6% chance to get double physical dmg off.
The barb i described has only physical dmg + lightning dmg( daedalus etc..)
So to me, using deadly strike is not a bad option. But this would only fit this character, why:
1. Bear stance adds 500% ewd
2. dex adds 1200% ewd
3. Wolfes add ewd
4. Essence of itherael adds ewd
...
so with endgame gear you can reach 2000-2500% ewd and this makes even a potential low physical source extremely powerful.
If i would use that glaive on a different character i would probably also stick to that arrow proc, but for this character i think that deadly strike is indeed more powerful
small calcs ( i assume 5 UMOs added):
Ancients hand (1/2 wdm) has a potential of hitting 25 times per second, therefore :
a) (warbringer) we get a boost of 2,5 times wdm in average (excluding the 10 max dmg for now which def. has an impact in this case as well)
b) (vizjun) we get a boost of 7.5 times the physical dmg
depending on your setup you should be better off using deadly strike