In the past I owned a Busse BATAC SE and loved it except it felt thick and short. So, I think my one knife would be a CG SJTAC.
I guess more important is that I dont know how to survive in the woods, so I dont know what kind of knife would be most useful. Judging from what I have seen on tv/news/internet, a machete/kukuri + small knife seems to be the choice for wilderness/urban survival and defense. If I could only take one though, I would not want just a machete or just a small knife--I'd prefer something in between.