With 3D you have all genres to choose from, because you have total freedom of camera movement on all 3 axes: x,y,z.
Camera position is also part of defining the game genre. So the same 3D models can be (re)used in different genres.
Platformer 2D character sprites for instance can not be used in JRPG (RPG Maker) as walking up/down is missing.
In 3D you have better control of lighting and correct shadows.