A lot of "survival" knives and hatchets seen to be over engineered and more an exercise in engineering. Trying to cover too many bases and scenarios.
For me a knife or hatchet would want to be simple (less to break or loose) and easy to use; the stress of a true survival would be enough to cope with thank you very much. A simple blade that I could maintain and possibly fix in the field would be of more use to me.
There was an interesting feature in SWAT magazine back in the 80's (Mr Fenna may be able to dig it out) where a simple Swedish (I think) bayonet was used as a base for readers mods. All I did to mine (I had one in the collection anyway) was to wrap paracord round the handle and stopper a few things in the hollow handle. (I never got round to shortening the blade to make it more usable).
It still wasn't great but more usable as in it's true form it was really just purposed for sticking in someones ribs.
Any blade to be usable has to be A) to hand, and B) easy to use for a few simple tasks. I'd rather it did a few cutting tasks well than be useless at cutting but also be a blinking awful spear, anchor, grappling hook excetera, excetera.
The two fixed blades I most often carry are a Karesuando Boar and my damascus Woodlore style knife.
(sorry don't have an image of the other on the computer)
They are great for most things on the hill and in the woods (and kitchen) and can be turned to battoning if really pushed; but I hate it and usually carry a billhook or Husqvarna hatchet if I know I'll need one.
So saying the knife I carry most often and so my everyday survival knife is a Opinel and it really does so much, great in a kitchen (some friends kitchen knives are shocking), great in urban life and the most used knife in camp.
Simple classic designs that do so much well and safely.