Knives are decidedly third best at chopping.
Axes are the best cutting tools for chopping. Even a small hatchet is way better than a big knife if you want to chop up wood for a fire or build a quick improvised shelter. A well made tomahawk is probably better than a six inch survival knife, too.
A machete is the second best tool for chopping. And it is better than a small ax for clearing brush or hacking a trail through the jungle, sort of one specialized version of chopping. But not as good for larger diameter or harder woods, and probably not good at all for prying. Any full-slze machete useful for the primary mission of clearing brush has to be long-ish. 24" is common. As such it is going to be kind of light for chopping down evergreen branches to build a shelter in the winter, because the steel is thin. Most machetes flex quite a bit in use. Machetes are second best for chopping.
Of course you can build a stronger machete by increasing the steel thickness, but the weight goes up. If you look at most burly survival knives they have blades between .18 and .25 in thickness. If you make a machete that thickness you are getting into sword territory, so makers cut the length way down, to keep the weight down, and usually end up in the 10" to 12" range.
You can see one of these in the ESE range, too.
Comparison of three categories of ESE blades for survival:
Let's start with your ESE 6: the steel is .188 inch thick, and the knife weighs 12 ozs.
The Lite Machete is .08 inches, less than 1/2 the width of the survival knife. It's 18 ozs.
The hybrid Machete / Knife in the ESE range is the Junglas is their version. It is .188 steel, it's got a 10" blade and it's 24oz's.
It's going to be a lot less efficient than the machete for clearing under growth, (too short, too heavy to swing for hours) but is a lot more stout. The hybrid might be the best survival tool in the knife (as opposed to axe) family. It is the result of building a machete w/ knife-like strength, but shortening it to make it not too ridiculously heavy.
As others have said there are a lot of variations in what "survival" means. Are you walking a long distance, or will it be something you carry in a 4X4 in case you get stuck in the boonies. Is your area hot, cold, desert, forest, ocean facing.
If you watch the program "Naked and Afraid" the contestants, a man and a woman, are dropped off somewhere and try to survive with nothing except one item they each bring. Almost always it's a very large knife / machete and some way to make fire. (A lot of the contestants are former special forces, or run training programs).
If you think about it the hybrid machete knife like the ESE Junglee is not all that different from the original American survival tool, the Bowie knife. For instance the Case Bowie has a 9.5" blade and weighs 20ozs, pretty close in size to the Junglee (granted a different blade shape, but one reason for the big nose-heavy flair in older bowie designs like the Case is to improve chopping ability).
But I still say, if I was going into the forests of the Cascade Range in a survival situation I'm prefer an ax. The classic Hudson't Bay axe is prized for portability. The Council Tools version has a two pound head, so probably weighs 3lbs total. Maybe you think it's ridiculous to compare even a large knife that can belt carried with a full size ax, the you have to strap to a pack. Fair enough.
The ubiquitous Easton all-steel hatchet the "Sportsman Axe" comes in 12" and 14" versions. (The 12" is hard to find). The model 24A (the 14" one) weighs 25 ozs, same as the Junglee. (Some prefer the traditional wood handle hatchet, those are typically a little lighter, or if you prefer a little bigger at that weight.) Another option is something like the Two Hawks voyager tomahawk, it's their biggest Tomahawk/Axe and has a 1 lb head, so probably weighs the same as a big Bowie.
I think a Junglee (or similar super duty short machete or very large Bowie knife) vs. similar weight hatchet / hawk / small ax would be a good comparo.