machette is just a falchion without a handguard. it has been a peasantry weapon for centuries because it is cheap to make because lol 1 edge
just grab the cheapest one or the one you find fancy and smash a handguard if you actually plan on fighting someone that has melee weapons too. or you can learn krabi-krabong and ignore handguard entirely
why would you do that? chainmail has been always inferiorto pretty much every other type of metal armor. lames, plates, scales, brigantine are all better at stopping attacks then it is. the only thing in which it was better was coverage. mind you, that is pretty fucking important. i will let you guess how many romans died to wounds to their unarmed legs