Cant give a good comparison but I will relate my experience.
The buck and gerber look like fine little pack axes. Great if you need to carry them any distance but Ive neither held nor used them.
My vote is for the Estwing. Cause its cheap!
It actually grabbed me when I was walking past the axes in Home Depot.
Hey it says!
I look back and have to stop.
Things got a wicked hawk shaped head out of a single piece of forged steel.
I had to have it.
The first day I left it whole but the plan was already in motion. Next day I chopped it off the same length as my tomahawk, right about two inches above the start of the rubber handle.
I peeled the handle off and wrapped it in friction tape. The handle is oval and still fills the hand quite well.
Then I spatter painted the head and shaft blue and black to prevent rust and be all nasty lookin.
In use it has nearly the same chopping ability it had before I shortened it.
Its heavier than my wood handled hawk but throws very well and there is no chance of the head coming off.
So, 35 bucks and Ive got a near indestructible hawk that looks like it belongs in my closet.
Oh yeah, holds an edge well and somewhat packable, Im thinking its much heavier than the Buck or Gerber.