Because in winter I need bigger knives, small and medium sized knives are all out. In my case these are the otherwise great Doug Ritter RSK, GB2, PM2, Native 5, Spydiechef. I also automatically excluded serrated knives and slipjoints, framelocks and compression locks.
Fixed: Bark River Aurora 2 3V (or Tundra).
Both are convex, with relatively thin stock and in 3V, so they also perform nearly the same, apart from the blade length, wich might be important for batoning.
Folder: Spyderco Native Chief Rex45 (or Military).
Amazingly, even though the handle size is bigger on the Military, the grip size is bigger on the Chief, while the edge length is almost the same. Because of this and the lack of hump/ramp, the Chief wins. Also, it is ambidextrous.