Everyone has their own camp routines. The tool usually reflects their needs. I carry a machete instead of a hatchet, because I think it's more versatile. But that's just my personal preference.
There is a point of diminishing returns, IMO, when it comes to splitting fire wood. It's hard to paint a word picture to describe what I mean.
I don't favor mauls, at all. They are heavy, blunt and wide. They split by sheer energy transferred to the wood, and force the fibers apart. A thinner blade, from a SB axe to an even thinner DB actually does some cutting. They require less energy to penetrate further between the wood fibers. I've been able to pop rounds of wood with the DB that the maul just bounced off. If the wood is gnarly enough to need a heavy maul, I'll go to a wedge and sledge first.
The other factor, of course, is the type of wood a person has available. Seasoned Larch, Cedar or clear pine is a whole different ball game than a knotty chunk of Oak, Maple or Hickory. Duh....
Yesterday, I was splitting some particularly nasty chunks of Douglas Fir from the top of a small tree. Knots going every which way, and the fibers were particularly fond of each other. A couple of times I got through to a cross-ways knot with the DB. It was able to actually cut through the knot, whereas a maul would have required beating on it until it snapped. It's a lot more efficient to cut, rather than break, IMO.