I'm kind of upset to find that axes are just plain worse than swords despite being considered somewhat of an official "weapon" in 1.9
I was expecting them to be on a similar level but considering they have lower DPS, don't favor weapon-based enchantments, and still take double durability when used to attack, there doesn't seem like any reason to use them unless you just don't have a sword
Maybe for PVP if you want to make sure each separate hit does the most damage possible you could use one then, but otherwise I can't see the point