You probably have your own favorites. I particularly like You are the sunshine of my life, For once in my life, Yester-me yester-you yesterday, Living for the city, I just called to say I love you, Sir Duke, A place in the sun, Lately and Happy birthday. Other classics (also excellent) include Superstition, I wish, Isn't she lovely, Ebony and ivory (with Paul McCartney), Never had a dream come true, Uptight and so many others.
If you only want one collection of Stevie Wonder music, this is by far the best. If you want to build a collection of his music, this is a great starting point.