What are you planning on cutting?
I've used three different machetes a lot.
One is an 18" US Army issued machete that I stole from my dad.
It's made by Ontario (the same people who make knives and bayonets for the military).
It's made of 1095 steel and holds an edge pretty well. I like this one the most for clearing light brush. It's short, handy, and doesn't flex too much yet isn't brittle.
The downside is the 1095 rusts easily. I keep it coated with a light layer of grease. Also the handle is slippery when wet.
I have a Barteaux 24" machete in my work truck. This thing is a beast.
The steel (I don't know what kind) is thick and heavy. It is pretty rust resistant. For clearing light brush it'll wear you out faster than the Ontario. It'll cut small trees almost as well as a hatchet.
The tanto profile is a little strange, but it doesn't take away from its cutting ability...it's actually easier to sharpen because you have two straight edges instead of a curved one. It's got a textured D handle making it much easier to keep a hold on. I suspect the handle will be more durable than most machetes because it's injection molded onto the blade. My very old Ontario has a crack in one handle slabs at a rivet.
The third is your average $8 POS with an 18" blade. I don't remember the make, but it's very thin steel with riveted plastic handles. The blade edge simply rolls over when you hit a hard piece of wood.
Some comments about machetes...
-Almost every machete I've seen or used that was owned by someone else sucked at cutting. This is an owner issue. If you regularly sharpen your tools to the correct edge angle then most any machete will cut decently.
-Also, almost all machetes, cheap or high dollar, come from the factory with a crappy edge. Get yourself a mill file and file the edge thinner. It works wonders.
-I find that longer machetes are often too combersome unless you have room to whack away or you're cutting nasty briars that you don't want to get near.
Do you really need a machete? I prefer gas trimmers with brush blades. If it's larger stuff then hatches can be more efficient (or better yet chainsaws
)
Edited to add:
I have used bolos and kukuris. These are real nice for cutting saplings and thicker brush fast. However, I think they suck at light stuff because they're heavier.