Stevie is my personal GOAT. I don't think any artist has had the peak or longevity that Stevie has had (He still crushes live). I think his 5 album run from "Music Of My Mind" to "Songs In The Key Of Life" is the greatest run of 5 albums in music by a pretty good margin.
While some of these albums will surely be recommended here in the Classics section, I want the first one I recommend to be one that is less heralded, but I'm probably as high on as anyone. "Fulfillingless" will be listed as a Hidden Gem here, even though it was commercially and critically successful, because it gets lost in the legendary catalog of Stevie Wonder.
This album doesn't have the overarching structure of sound that "Innervisions" has, nor the selection of hits that "Songs In The Key Of Life" has, but it is still an absolutely beautiful album. The vibe of the album changes from in-your-face funky to subtle and personal, and back and forth again, but Stevie nails each song.
Standout tracks include, "Boogie On Reggae Woman," "Heaven Is 10 Zillion Light Years Away," "They Won't Go When I Go" and "You Haven't Done Nothing," which is just as good or better than the similarly-styled, "Superstition."