Hmm, realistically speaking pretty much any knife made by a reputable manufacturer today is probably good enough at what it's supposed to do. Even something as inexpensive as a Mora or SAK should be entirely sufficient in most survival situations, at least when used with common sense. Obviously your choice is going to depend on several factors, for example what kind of blade you can EDC and what you'll need it for.

There is no such thing as an indestructible knife. I'm not even sure I'd want one. It definitely wouldn't be my priority. IMHO a knife should cut well and should be practical for most tasks that I'm going to encounter in my particular environment. Anything else is pretty much secondary.

Actually it is possible to make a knife with a thick blade that can take an extreme amount of abuse before it falls apart. However, in order to achieve that you'll need to make the blade profile overly beefy, so much so it's going to cut very poorly. In other words you'll end up with a somewhat sharp crowbar that just sucks as a utility knife. IMHO a knife is much too valuable an asset in a survival situation to be abused as a shovel or crowbar. In any case, if you really need to dig a hole or break a lock you'll soon find out that even an oversized "survival" knife with a 1/4" spine is lousy for that kind of work.