A tri-blade/brush knife will cut circles around the sawtooth blade. Have both and the sawtooth blade will sit and rust away. The tri-blade goes through stuff like butter.
Tool meet job.
A tri-blade is the tool if the work is heavy grass.
It will beat your machine and you to death if you are cutting wood.
A circular saw type blade is the tool for wood. Grass doesn't offer enough
resistance to get cut by one. It just bends. Dad made one from a saw blade.
Saplings, berry vines, woody type brush, it just destroys.
No experience with the chainsaw tooth type. It would be easy to sharpen though.
Honestly I think it wouldn't be as good as a blade. Too thick, too much kerf.
Wasting energy making chips, all you need is to cut.
If you want to play with these type cutters, you need handlebars and the safety
shroud for a blade installed on your machine.
A metal blade is serious business. If it kicks off something or you just contact
your feet/legs, it's gonna get nasty, right quick.
