Got pics?
What I've learned from a really well made maul (Mueller) is that head-shape is crititcal. Sharp edge with no bulges behind the edge make it much more effective than box-store cheapie.
Often with said cheapie, you could see some crushed fibers where the split was initiated. Nothing ever of the sort with the Mueller and a couple of mauls I've modified to similar shape with disc grinder.
Then, besides that, really good metallurgy tops it off. The good ones require master craftsmanship.