I have one and have had 2 Reeves with a 12" OAL.
I also own one of the Ft Meigs Nessmuks that Ragnar sells
I have also owned one of the Marbles you mention.
All 3 are difft. The Marbles seemed the biggest, heaviest and clumsiest and had the worst edge. Because the edge is very fat you have to watch for glancing
The Ft Meigs double bit is much sharper but still the edge on both sides is fairly steep, and you have to watch for glancing. It's really light weight but feels forward heavy due to the thin handle. You also must place your chop more carefully due to the narrower bit and long 14" length.
The Reeves is totally different for me. One it is not a forward heavy, but at the same time the bits are very wide. It is also much finer edged than either 2 hatchets so it cuts deeper. Also because of the shorter length I don't get the willies as much from the other edge coming back at me while chopping.
One of the things about the technique I have got into with the reeves is that I seldom wail away with it, swinging full force.
In general I have a tendency to choke up on the handle and use it to make very precise cuts to cut something up. Only occasionally do I use a full force swing. It's almost like a woodworking tool or something.
One mistake I have seen people make is to chop straight down thru stuff.
Chop at an angle down one side, then on the other side to meet it for a wide notch. Then work your way in from the right and left sides to remove wood on 3 sides and then the little bit in the middle can be cut. I'm talking on 4 to 6" stuff.
For chopping limbs up to say 4" what I like to do is this. If you can stand it up on one end, then shop one side, rotate the limb, chop, rotate chop rotate chop till you are all the way around. Then a sideways hit with the hatchet or even stomping with your foot will cause it to snap. You can cut big limbs up into small logs easy this way. Also doing it this way you are choping down and somewhat away from your body, where if something is laying down you have more of a tendency to come back toward your body.
I'll say I have never cut myself with the Reeves on the edge that I wasn't using, but I HAVE cut myself with the other edge. Not while chopping but the thing is so damn sharp if you aren't careful even a slight brush across your finger will lay you OPEN.