Horses are more sure-footed

Horses are more sure-footed than camels. Although some people may
dispute this, there is no way that a smooth camel foot can have as
much traction as a horse hoof, especially on muddy or icy surfaces.
However, a camel does have one trick in precarious terrain -- it can
drop to it's knees and crawl over the steep spots. And the soft camel
foot is more environmentally friendly -- it will leave hardly a track,
where the sharp horse hoof will cut up the trail (by the way, camel
droppings are also more innocuous and less offensive to "non-animal"
people on the trail).