1. Oathbringer. The Sanderlanche is incredible, definitely my favorite of the series, and I love all the character growth and angsty moments for everyone. Shallan's scene with Hoid, for example, is one of the moments guaranteed to make me cry every time I read it. Dalinar's flashbacks tie in so well with the present-day story and make me feel so many things, and Vivenna is in it and I love her. Also, the scale expanded so much in OB, and we learned so much more about Roshar, the Rosharan system, and the entire cosmere. And so much Unmade lore!!
2. Rhythm of War. Close second in terms of emotional moments, just because reading Kaladin's character arc feels like being punched in the heart eight million times. I also love Navani and Raboniel's relationship and the excellent Investiture science that happens in their plotline. Some parts of it felt messy and unnecessary to me - Venli's flashbacks and Kaladin's node fights come to mind - but it had enough amazing moments to make up for that.
3. Way of Kings. I adore this book with my whole heart, as it was my intro to the cosmere as well. I have an unhealthy love for Shallan's arc and the angst it culminates in at the end of part three, and seeing Kaladin form Bridge Four is amazing. But it spends a lot of time on (necessary) setup that isn't quite as fun on rereads, and I find Dalinar and Adolin's WoK viewpoints to be a bit boring and repetitive.
4. Words of Radiance. I love the focus on Shallan's emotional growth, and it's satisfying to see all of our WoK viewpoint characters' storylines converge. It only earns its spot in last place because it's the least memorable Stormlight book to me (I can literally never remember what happens in the Sanderlanche). Also it doesn't have much Jasnah, which is very sad.