Serrations. I forgot to add a little bit about serrated blades. If its for a long term survival tool in the wilderness with little resources, do not buy a blade with any serrations on it. They are hard to maintain and keep sharp in a tool shed, let alone out in the field for days and weeks ata time and in constant use.
However, if you have rope and need to work it, carry a second blade kept soley for this task. Either this or keep your main blade sharp
I am in no way linked to this web site, but I do possess a few of these Mora knives and can attest to their ability to be perfect back up bush craft knives.
Razor sharp, light, but with awesome size to strength ratio I feel that for the very low cost they are excellent to stow away in your kit bag.
http://www.bushcraftuk.com/index.php...uct-flyer.html