I definitely prefer shorter works to longer. Not that I don't think the world of certain long-form works. But for me, a book really needs to work to justify its page count once it creeps over 300 pages. Plenty of books do, but I can't count the number of books that I think would've been better off shaving 50-100 pages, or divided into smaller books. Heck, I would posit that if A Song of Ice and Fire had been released as a longer series of 200-400 page books, GRRM wouldn't be stuck these past 14 years.