Focus is generally preferred because if you crit a lot with critical damage buffs (DW/BD dance) you'll do some truely sick damage.
but, if you roll with a SWS and BD I think the Crit damage would be better caus on my AW I crit a normal white mob with BD/SWS for 1500-2000 and ALOT ^^ B GRADE
Also, critical damage adds a set amount of damamge AFTER all buffs. So i got mycelf focus. I never go to crit rate limit (500) and my damage is maxumum boosted from my buffs, tats and togle skills.