Can of worms question and you'll likely get all kinds of responses (though MTD players seem to generally be less inclined to think that "wood doesn't matter" tone-wise). I've read a lot of comments about ebony being more "focused" in the low mids, producing a stronger fundamental than maple (possibly the same thing as being more "focused") and - the term you're likely to hear most often applied to ebony - a "ping" to the note. Maple is often regarded as contributing to a sound which emphasizes harmonics but with a less pronounced note fundamental. In real world settings, however, anything is possible. I got scared off maple for a while because a number of my maple-boarded basses were not sitting in the mix in a way I liked (this included a 535), but my current main player has a maple fretboard. Sometimes you get lucky and sometimes you don't (as I often say, any custom order is a crap shoot). My next bass will have an ebony board. Fingers crossed I end up liking the sound of that particular bass.