About SA on Berzerker Blade ???

Hello

i would ask ppl what you think about SA on my berzerker blade for AQ ?

I have now a +7 Berzerk and i want to put sa on it , there is :

- Focus : increase critical rate permanently by 15 %
- Critical damages : gives more damages when critics
- Haste : increase attack speed by 7 %

well, i think they are all similar on a RB you hit so many times , but maybe with mathematics it results that one is better ..... too boring.

I would choose focus (i've critic damage on my +3 atm, it's nice anyway )
but i wanna read your advice about that...

And I wanna kill that bitch QA in the end

get focus, no other way

ty