Some people like Vector Art over Pixel art. In general, it can be easier to make, and at the least it is probably easier to modify as you can simply adjust curves. But, it takes a lot of work to get vector art to be nicely shaded, as curves/paths are generally outlined, filled, or both, but you then have to make some small shapes to get shadow and highlight.
Also, about skeletal animations, that isn't dependent on Vector art. You could use pixel art as well.