I think I gotta go with Dalinar currently. Maybe that’s partly because Oathbringer as a book was so epic, and he was the sorta “main” character for that one. But I also am really invested in him because of his tragic life, between the death of his wife, and his alcoholism, and now turning his life around so intensely just in time for the seemingly end of the world.
I also love Wit and his ability to pop in and out of the story and offer his snarky observations.