There is a Machete and an e-tool along with 50 ft of stout rope and other things, behind the seat of my pickup. But when I walk away from the truck, it all stays there. Depending on where you are and what you are doing, from day to day the "best" tools to have on your person may change.
Check out videos of folks who have backpacked for extended periods on the Pacific Crest Trail. Most carry an effective but minimal blade as weight is a constant issue for them. . . .and they are in the wilderness. On a different budget and wilder scale, the same is true for Everest trekkers.
If one is out on a two-week guided hunt in Montana or Idaho (I
wish), the 'best" blade to have would be different. This fall, our son went on a mission trip into the Peruvian rain forest on the Amazon. I'll have to pointedly ask, but its pretty sure that he didn't bring along the gut-ripping throat cutter he wore daily as a Marine in Iraq.
There is not, nor can there be, a "best" survival knife. Bring along what you can conveniently carry or pack and rely on your caution, skills, and judgement.
And read "Deep Survival" by Gonzales. https://www.amazon.com/Deep-Survival-Who-Lives-Dies/dp/0393326152
Then Read "To Build A Fire" by Jack London.
neither one deals with specific tools or skills. Both talk about the mental state of those who make it out alive and those who do not.