fort is best in pretty much all cases unless you are trying to do some kind of weird fade buff with treachery

Between fort and treachery

slowing your merc down can be viewed as a good thing if you want him to stay close to you

for the fastest dps with infy, use thresher/giant thresher polarm

eth andy(30fres/15ias jewel)
Treachery eth ( or the xpensive verison i uses. black hades(3x40ed 15ias jewels)(120ed/45ias)
you need to reach the 75 ias brake point for thresher polarm. thats the fastest dps polarm around.
good luck

highest dps is different from fastest attack

DPS. damage pr sec

black hades is bad
if you can get fade to proc, treachery is superior
if you can't, it's better than treachery but still worse than forty

ca is more dps than gt in the absence of CB
with cb it depends what you're doing

What kind of comment is this??? Probably lsd induced. Don't ever listen to him.

The answer to his question. Must I word it more slowly for you to understand?

ive been testing all kind. forti, treachery, black hades and duress +some other not to be put here
theese 4 are the best armor for merc
treachery sux.. seriously, cuz fade DONT proc as fast or at all when u need it. if high def. nvm
low def. merc dies if fade not proc. conclution. treachery sux
b hades have the same ias(3x 15ias)
more def than non eth treachery. almost same def as eth treachery.(depence on choise of treachery eth armor..)
if you use treachery for the fade. forti is better- more resist, if u use treachery for ias.. black hades is better.

just look here..
Treachery: 33 hits, 6.60 seconds
Duress: 29 hits, 6.97 seconds
Black Hades: 31 hits, 6.20 seconds
Fortitude: 28 hits, 6.73 seconds

tested on solo dia merc kill.