survival knives need to be compromises between all of the edged tools needed. You may only have one survival edge in your kit when you need it. A cleaver / ax / machete will be handy for clearing trail, harvesting wood, chopping veggies but relatively useless for drilling holes, digging, splicing rope, - or any other task which benefit from having a point, skinning, carving, whittling or any other task which benefits from the belly of the blade. I find the form of a decent 7" hunting knife such as the Becker CU7 to be a good compromise in all of these tasks and still has the heft and flatbladed section to do some serious chopping. Still doesn't perform well as a fillet knife when fishing tho - compromises are just that.