If you're trying to split wood, a sharp ax is the last thing you want- needs to be blunt enough not to stick in the wood. That's about all most folks use an ax for these days (even limbing is better done with a chain saw). Splitting maul is better suited to bigger and tougher splitting, but I'd still rather have a dull ax for easy-splitting wood- not so much weight to swing around.
Even better is my neighbor's wood splitter. . .