Just another thought to consider...wooden handle hatchet.
For me...I just like the feel and looks of wooden handles...and I like to customize my handles with some simple cross hatching in the grip area to aid in controlling the blade attack...and to help keep a grip when your hand gets sweaty or tired.
Of course the Estwing, Gerber and others like Schrade, Kinfolk, Marbles, etc. with head and handle full length metal using various hand grips may be stronger, I find if you use them alot...you will notice greater fatigue in your bones and triceps, I think because of the vibration.
I have definately noticed this to be true in hammers as well. The single piece head attached to a wooden handle must take away much of the vibration as well as maybe the wood material also absorbs it too.
I have both, and use the full metal style when I do work where I worry more about breaking the handle.
Something else you may try as well....I've collected some very nice and unique hatchet heads over the years...I enjoy these as I do my knives. And I have collected downed limbs from Beech, Maple, Ash, and my favorite White Birch (leave the bark on this one) and craft my own handles. Kinda don't mind breaking handles, because I also enjoy fitting new ones...each one ends up different. I break most handles from throwing...seems I find myself doing that even when I should be working with them.
I realize this may be off track from your question...so hope you don't mind the added thoughts.
For What you asked..I like Estwing...best handle design and best grip in my opinion...and well balanced. Of the full metal body I think they consider vibration problem the best....edit( I may have got off track with hatchets..vs. axes?? Does Estwing make an axe?? anyway...my feelings on axes would still apply...I collect even more axe heads...and enjoy the wooden handles, although I use just store bought handles on my axes...and prefer the double-headed style most. Some head styles are tough finding replacement handles.)