Twok? not Words of radiance? which i think is the majority opinion?
Twok was an excellent introduction to the series, no doubt! But words of radiance was fulfilling of a promise made in twok : to see kaladin interact with Dalinar and adolin and develop a relationship filled with mutual respect!
But Oathbringer, on a reread you realize just how excellent it is. It gave us so many answers, we got to meet 5 unmades! all three shards! we went to Shadesmaar and I just love Dalinar's arc and its resolution in the book! I did not expect brandon to make Dalinar such a ... hateful monstrous war-monger!! but he went there and still made me forgive him. And then the whole I am Unity is the best endings for me!