I didn't think it was possible to like WoR more than WoK, but it happened. I really think it's because the last ten chapters or so were so incredibly satisfying to read and I really felt like I had been through a super intense experience by the time it finished, plus I loved getting more of Shallan's back story. Not that I didn't love getting Kaladin's in WoK. Arrrghh they're both so brilliant, I'm really glad you had both as an option. But ultimately I have to say WoR, by a hair.