Anything with colorful pictures that illustrate the plot helps the child connect better. Eric Carle and others who use vivid colors are great.
If the child hasn't been reading very much, shorter books are best first (The Very Hungry Caterpillar by Eric Carle). If they have a longer attention span or sometimes like to listen while playing, longer books are great.
If the child has older siblings (preschool through mid-elementary school), I like to read chapter books, up to 20 pages at a time, during quiet time. Discussions about predictions, vocabulary and theme go over a toddler's head, but they understand that everybody reads and not all books have pictures. I love 5 Little Peppers and How They Grew, James Howe, L. M. Montgomery, etc.
Board books and cloth books that they can manipulate by themselves are wonderful. I don't allow toddlers to have anything by themselves that they can tear, but cloth books are great starting as soon as an infant shows interest, and best of all, they're washable
