You can fly using Feruchemy by reducing your weight to zero and flapping your arms. Assuming you've strapped on wings.
If thats true then you would not be limited to were you could fly or your altitude like you are with Allomancy, because your not dependent on having metal to pull and push on. Feruchemy would offer a free
and untethered experience. Allomancy with an ample amount of metal to push and pull from would have a easy time with speed and maneuverability
but great altitudes
would still be hard to come by. Water crossings are probably out of the question for Allomancy unless the water does not reach depths of real consequence, then you might be able to pull off some sort of wacky Vin horse shoe maneuver.