DB's subs, being a speed subber, aren't entirely accurate. And their [video] quality does seem [(very) slighty] lower than Lunar.
Just my 'lil comparison...
Lunar and DB had different subs for IchiHollow's black Getsuga though (DB translated it as Byakuya actually naming the attack while Lunar dubbed it as Byakuya being shocked about it being black rather than...blue I think. Lost track of colors since I've been reading the manga more often.)
Just a rant there...
Plus, I like to have my fansubbed animes all from the same group for organization.
And Lunar is still translating (63 was the latest), but one of their people lost access to the internet or something so they've been slowed.