I dont PVP, and my problem is that I cant murder enough Pumpkings fast enough. Warding wouldnt help me here.
Well then lucky or menacing would depend on your gear. I recommend using menacing on a ranger because rangers already have very high critical hit, and lucky on your melee character to knock the guts out of pumpking with your flairon. Nothing matches the flairon for dps, unless you can achieve critical-mass with the horseman's blade.
If you don't have those high-tier items, make a crimson world and a corrupt world, and get the vampire knives and the scourge. The scourge kills things rapidly, and the knives can help you survive, and both weapons are spammage.
To reach critical mass with (ruthless or legendary) the horseman's blade, you need to do the following;
beetle set, beetle scale armor
celestial stone - violent
fire gauntlet - violent
mechanical glove - violent
ankh shield (prevents headless horseman weakness debuff) - violent
your favorite wings (I like the hoverboard or fishron wings) - violent
You also need to reach wave 15, I recommend using these weapons to get there quickly;
Ruthless Paladin's Hammer - sweeps crowds, launches farther with attack speed bonus
Ruthless Vampire Knives - Use when at half health
Ruthless Flairon - use against individual pumpkings
these buff potions, recommend 4 each;
ironskin, endurance, well fed (pumpkin pie), wrath, rage, heart reach, life force, tipsy (sake)
Violent is interesting for melee for more than the obvious reasons;
Paladin hammer and vampire knives reach farther for this set-up. Paladin hammer is especially amazing with high attack speed.
All weapons get even faster with beetle scale set bonus.
The faster Horseman's Blade will cause more homing pumpkins to spawn during critical mass.
What happens during critical mass;
At wave 15, the pumpkings swarm. Use the horseman's blade. If done correctly, you only need to jump vertically and swing your horseman's blade. Pumpkings should begin dying fast enough to keep you alive, so don't dodge. Moarning Wood causes more damage, so don't tank them. Fly to a high area and watch pumpkings drop like flies until day breaks, and, if you remember to re-buff when your buffs dry up, you should have more drops than you'll know what to do with.
Also, menacing can also reach wave 15 solo, but only if you have the above gear. Maybe you are still looking for a candy corn rifle, some trophies, or want some scrolls for your summoner.
Don't overlook Violent, especially if you have a Paladin's Hammer.