The sawteeth-no sawteeth option has great visual appeal on the knives for which it is an option.

IMHO, other than ripping through the skin of a helicopter or its plexiglass components, the sawteeth have 'zero' functionality. You can't really saw a tree branch with them. They do look menacing. I guess if you ever get to use a knife so equipped in hand-to-hand combat, the opponent might wet their pants and just surrender at the sight of such a fomidible and intimidating weapon. That would be cool!