Were it to be the only tool I could have, I would take a 6"-9" at 3/16 to 1/4. A Vic Champion XLT is on my belt every day and a NWA Scout is in my bag. I also carry a GB Mini, and a saw. Accompanied by other tools - 4" and 3/16 works for me. Construction, steel, handle material, proper heat treatment, and edge are also factors I evaluate.