Whatever you decide to go with, I'd suggest keeping the max weight at no more than 8 lbs, (or e.g. that 8 1/2 lb. Saxon Splitter), that is, if you're of average size. Unless you're of the Paul Bunyon, or maybe Sergeant Daniel Whitley type stature.
Once I made the mistake of getting a 10 lb. splitting maul. Once!

And even though I was in stout condition at the time, swinging lots of axes & hammers, (incl 28oz framing axes and 32oz Vaughn framing hammers, whilst building log homes & timber frame homes, garages, bunkhouses, barns &c), I never liked using it because a 10 lb. maul can get tiresome both while swinging and lifting with one arm— when setting-up/stacking upright your next piece to split— as @jonshonda indicated above.
So I agree that lighter is better. And have several good splitting wedges at the ready, for big or gnarly rounds.