Not that it will help the OP much in deciding/purchasing a new maul/ax , and apologies for going against the thread title - but this is my humble opinion.
As long as You split rounds a maul might not be the most optimal solution - also largely depending on the wood You intend to split.
I have been splitting firewood rounds almost 3/4 of my life and I did so using various axes.
Some were just wrong for the job, others did a average job at best.
But ONE stud out from all the others, and I've been using it ever since I got my hands on it.
Numerous times I've been told that a maul would be a better choice and I often thought about buying one.
Well, last year I kinda did it, I bought a splitting ax (maul+ax hybrid) and while I was at it a big ax, both featuring "plastic/fiberglass" handles.
They are Chinese "BigLeaf" products off eBay, most likely copies of some other brand.
I tried them and I am not impressed at all!
The axes head is too narrow and it simply gets stuck in fresh oak rounds and bounces off knotty rounds.
The maul+ax hybrid is OK, but
it requires much more force to split oak rounds than my faithful old-school ax does and the blade is too short making it stuck way too easy in knotty rounds.
In my opinion both, big ax and maul/ax hybrid, do NOT benefit from the "plastic" handles - they seem to flex and as such "cushion" the force intended for splitting the rounds. I also feel that the handles are way too short at ~32", but that is a matter of personal preference.
In short, depending on Your intended usage the mauls/axes head shape and size matter the most, followed by the handles length - weight is more of a compromise trying to make up for a bad head shape.
My favorite splitter is the ax pictured below, mass unknown, current
wooden handle 40" long, powered by 105Kg body mass at ~190cm body height:
Yes, the head came off!
I was unable to source a new handle that was at least 40" long AND wide enough to securely hold the head, so I just reseated the head onto the old handle.
I have a video of this ax in action, will try and upload to YouTube.
This ax WILL go through oak knots, granted not at the first swing but it will split them with some persuasion .
Oak and beech rounds that are not knotty split apart without me exerting a true swing.