Historically heavier riders rode longer boards, simply because the additional surface area was necessary to float the rider atop the water. Longer boards are also known to be more forgiving, or softer feeling, upon landing as that increased surface area floats the rider higher atop the water. Height, however, also plays a role. A taller rider on a smaller board will have a higher center of gravity, which could result in more falls. In contrast, shorter riders riding too long a board may note it feels sluggish when edging and turning.
Content extracted from https://www.boatingmag.com/three-things-to-look-for-in-your-next-wakeboard/