Carothers knives are great. I have a FK and light chopper. Good Edge retention, edge stability, toughness, and corrosion resistance. I have been very impressed with these knives!!
I just got a Z-FiNit survival knife, that steel, I was blown away! Extremely tough, holds a good edge, amazing stain resistance, very good edge stability! Just wish more people would make fixed blades out of this steel.
Gollik is on the forum selling his knives. He will make a knife out of Elmax or Sleipner steel. I am considering ordering one of his knives, I hear good things and they seem designed for function. He has very good prices too.
Other makers on the knife maker for sale area here.
Survive! knives if you can find one for sale, or if you are patient, you can order from them when they have some.
Robert Martin at tearofthesword, I have a slimline machete of his made of 3V stock. I love it! It is tough as nails and holds a fantastic edge. I use it more than any knife I have, including folders. He has great prices and will make the knife you want, if you have a design in mind.
As to your question, what is the best. There are too many great blades nowadays to choose from. I would say the one I have from Robert Martin for me, because I use that about everyday. For a smaller survival knife. Carothers, or my Z-Finit of which I can give you info on the maker if you want. I have not got my survive! knives yet, so can not say anything about them, but I hear they are fantastic.