the main reason behind the machete is more for a tool for other things but also a weapon it needed. if i had to go with something strictly for killing i would swap that for the "gerber gator". its not as tough but has a long reach, saw blade and injection molded handle that likely will never come apart.
but the original choice has a pry bar, saw, and thicker blade to dilever a firmer blow.
1. sniper rifle , as long as i can stay out of sight at a safe distance.
2. remote detonated c4 explosives ., lure the zeds into trap and detonate the c4 surrounding the zeds.
3. assault rifle , to pick off any zeds that managed to aurvive the c4
but more realistically considering where i live
3. biggest knife i could find. but preferably a sword