Southard and XM-18 Spanto have the same blade thickness. XM-18 is a better chopper because it's heavier, but the Southard is a better slicer. Very good slicer. Whittling, Southard just shaves off wood without effort. XM-18 does a pretty good job at it. I have actually batoned and chopped a small tree down with my Southard. No blade play at all. The shock of the batoning did unlock the blade, but that's only expected. From chopping the lock didn't disengage. For Southard, that thick spine and belly is what does the work where as the XM-18 it's pretty much a folding ax. People underestimate the Southard.