As I recall some double-bit axes have different profiles on the two edges, one being thinner for different cutting requirements. My favorite axe is a double-bit cruiser. It's an older axe with good steel and a harder edge than you find on many of the current axes. Just don't hit any rocks. I have and older axe hear with a big chip from hitting something not intended. Those harder edges will chip out.

/cruiser/ No affiliation, just a good write-up re Double-bit Cruisers.