the mattock does have the highest damage but i don't believe it gain xp for killing mobs. so you will not get buffs. If you use the dagger you or make metal swords you can get the lifesteal mod sometimes. My old dagger had knockback on it. once maxed you can add the increased undead mod to it if it does not give it to you. There are cheap too so you can make many and max then out and then add buffs to them for the different mob types.I don't I build a wooden gate and use dust and dark glass to wall up my exit ramp, then bunker/pillbox through the night. Besides, the simple trench won't keep everything out so your going to want to hide in anyways, unless you make a super small trench that barely gives room for one or two trees. If you do that then make a bone pan and/or mattock. The pan has great knockback (?)and gives a slowness debuff(?) while the mattock has the highest non-weapon damage I've seen in basic tinkers tools (+6 bone tool damage).