Tough question hahaha.
If I really need to choose one, I think Dalinar would be my favorite, his overarching story I think is the best, to see a men on the Dawn of his life, seeing that most of it is full of death and regreating all the damage he has caused and reevaluating if all of it was worth it , accepting he had been a bad father, a bad husband, a tyrant in many ways a fair one but a tyrant nonetheless yet probably the only person in his society with honor seeing all his flashbacks, the person he was and who he becomes, realizing the most important step a person can take is not the first but the next, accepting his flaws and being better just did it for me. I remember thinking the first time I read Oathbringer "damn I really admire this guy" although I emphatize the most with Kaladin I think Dalinar is the best character Sanderson has written and the climax of Oathbringer is probably the best thing I have ever read in fiction as a whole. What's yours?