For me, it goes Words of Radiance, Oathbringer, Way of Kings.
Way of Kings just takes so long to get going. I actually thought it was overrated from what others had said. Don't get me wrong, the last 3rd of the book was fantastic, A-tier. However, it just takes a long time to get there, to introduce the world and characters. I believe it is necessary and pays off later, but still paced a little slow.
Oathbringer's dive into Dalinar's story was just pure gold. He went from 2nd favorite character to favorite character in the series. It took me my second read through to truly understand everything that happened in the end of the book. It does suffer from some pacing issues in the middle, but overall an absolute great book. I love how everything seems to be happening in a different way than it ever did before in Roshar's history.
Kaladin starts to suffer from whiny character syndrome a little too much. Hopefully he isn't in this frame of mind for the next 2 books. It was also great seeing all of bridge 4 start to com into their own. As for Shallan, the first book she was boring, the second book she was awesome, and the 3rd book had her start to get a bit annoying.
Words of Radiance is just entirely awesome. Every character's arc was fantastic and the ending was more epic than any other story I have read. When he says the words... I mean... yes please! I also found WoR to be the best paced of all the books, so far.
Overall though, the entire series is epicness of a level I have never read before. A universe that spans multiple worlds with their own stories and how they interact is so cool. POSSIBLE COSMERE SPOILERS I still believe we will get introduced to more world jumpers other than Hoid. I also can't wait to find out more about Hoid and what he is doing. When you read more of the cosmere and arcanum unbound, you start to find all the little easter eggs. Like the lighthouse keeper in shadesmar asking Kaladin what heightening he was. Hoid practicing allomancy in WoR, and FREAKING NIGHTBLOOD!!! I mean... you also see Vasher and Vivenna in Roshar? That makes me giddy for a Warbreaker sequel! I am now starting to wonder if we may get a Kelsier appearance in Roshar...