for me the question is like asking "which do you like better, beer or wine?" beer is heaven with pizza and pretzels, wine is great with pasta and grilled veg. know what i mean?
i remember Glen Cook's Black Company stuff as being fairly cutting-edge when it first came out. loved it to bits for what it was and i think Cook deserves a lot of credit for pulling fantasy into the new millennium. his contemporary-ish characters dealing with realistic-seeming and unpleasant (world scale) problems broke new ground in its day, or broke it more engagingly than his contemporaries. on the other hand it doesn't seem to have aged too well: my recent attempt at reading the omnibus stalled out pretty quickly.
Abercrombie on the other hand is writing in a different style and, i believe, in a genre that has morphed considerably since Cook started with The Black Company. I think JA's greatest strength is his outstanding characterization and excellent descriptive writing.
but JA is writing in a time when we can pretty much assume the realities of multiple theatres of war, global-scale corporate corruption and massive infrastructure decay (although i freely admit these don't feature directly in either authors work they do provide a texture, a sense of the place, a collective 'given' about the way of the world). i would argue that such was not the case when Cook started Black Company and as such he needed to spend a fair amount of time painting the scenery whereas JA has pretty much just walked into it and started doing his thing.
to put it another way, Black Company was hot stuff 20 years ago but if i was to reach out today for a re-read i'd probably end up with The First Law in my hand. in fact i started re-reading it yesterday, so there you go.
