Well, they're really not covering the same period, the Brian Daley series was written in the mid-1980s right after ROTJ if I'm not mistaken and take place (I think) 4 years before ANH and IMO have that same sort of feel as the Lando Trilogy. The AC Crispen trilogy was made maybe 10 years later and I think the last one was published in 1996 or 97 and lead right up to the cantina scene in ANH. The AC Crispin trilogy is IMO the superior one, but you do have to give credit to Brian Daley b/c he had nothing but the films, the lando trilogy and Splinter of the Mind's eye to draw info from.