I know I've already said I wouldn't want either knife as my only TEOTWAWKI choice, I realize that probably wasn't much help, so in my mind I decided to reframe your question to this: "I really like both of these knives, and have the opportunity to purchase the one of my choice at an extremely good price, if you had the chance to make the same choice, which would you pick for a TEOTWAWKI scenario, and why?"
I'd still say that a blade with a 1/4" spine wouldn't be my ideal choice, but given these two knives I'd definitely pick the Entrek over the Tops. My reasoning is the grind of the blade, the Entrek has the advantage of being thinner at the tip than the Tops, this helps to overcome the general disadvantage of the thick 1/4" spine, it's sort of a compromise, but at least the tip is ground thinner, so it's like having the first 5 inches of a 1/4" blade, and the last 2 inches of a thinner blade. The clip point and swedge of the Tops knife still leaves the tip of the knife very thick, which is good if you're stabbing oil drums, but not so great it you need to do some detailed cutting.
I'd definitely pick the Entrek, and I wouldn't be bothered by the 440C vs 1095 steel choice, I like them both. I will say that Ray Ennis made me a custom knife out of 440C over 25 years ago, when he was making knives out of his gunsmithing shop in Grand Forks, ND, that knife has been to over a dozen Elk camps, and has been a near constant companion whenever I've had the chance to go hunting. I've got hunting knives made of fancier steels, I judge them all by whether or not they can hold their edge working through an elk as well as the knife Ray made for me.
Enjoy which ever one you choose...
Erik