This can be a deceptively difficult question.
What often gets left out of the discussion is what else you're going to be carrying. This will largely be dependent on the length and nature of your outing. If you're going to be taking a long a hatchet, axe, or saw, that will likely change which knife will be ideal for your situation. And weight combined with your physical abilities are to be factored in. A fit outdoorsman in his 20's with fresh legs will probably be able to have more flexabilities in his choices over a more 'seasoned' fellow with more natural ummm, let's call it 'insulation.' And how severe is the terrain? Lots of tough trail with steep grades, or relatively mild stuff? If you're doing more than a local day hike those are all things to be considered.
I haven't handled a ton of Bussekins, so my perspectives on the specific brand are fairly limited. But I've handled many knives over the years, many good ones.
If you're not going to take along a better chopper/wood gathering device, probably something in the larger size will work best for ya. 7+ Inches. But there's diminishing returns. Go too big (over 10" or so) and it might be a problem to pack and use for more routine tasks, cutting stuff, camp chores, etc. If you're going to take this big a knife, probably best to pair it with a quality smaller blade or folder.
If you're going to pack a saw/hatch/axe, I'd say probably something in the 4-6" range is going to be the best all-rounder. A useful blade design, something like a drop or spear point that can be used for multiple tasks, with a strong tip is getting my nod. I'd still pair with a smaller quality folder and/or multi-tool for other tasks.
FWIW, I've got several knives I'd feel confident strapped on my belt on an extended outing. But my favorite thus far, and if it were a life and death trip would be my choice, is the Tankbuster. For me, all things considered of what's currently out there and what I'd take, the TB would be my choice. Good overall size, multiple carry options, strong tip, plenty of belly, sabre grind for strength, etc. makes it my choice. It would be paired with a quality multitool or possibly folder (something with serrations). A compact saw like the Sawvivor or hatchet like the Timberline or Kershaw Camp Ax would also be in the kit.
The SRKW M6 would also be an excellent choice.
YMMV. Just my $.02 worth.
BOSS