When a HK char is made, in my opinion go mace.. HKs in these maps dont need the extra defence coz the creeps dont do much damage.. For solo/questing, mace is the way to go..
If u are a HK who wants to lvl real fast, go in parties to higher lvl maps, better go sword coz that little extra defence can save ur butt

Come Hatrel. Lets just say u are a HK lvl 130, just G9 and u have a good MACE set and a 4+ elemental SS. U go start hunting in Hatrel Maps. You'll find it surprising to see how ur HP dips even though u are on breath.. U will deal good dps but u have a problem tanking many mobs at the same time.
On the other hand, a sword HK with a good set and a 4+ ele SS, tanks much better and does almost the same damage. Its the Crits that matter and imo, I've seen swordies do good damage with a SS..(lvl 8+ weapon).
If u are the lucky ones who get WZ and lvl ur set up, then mace will really kick some *censored* in Hatrel. Mace will only Rock if u have a VERY GOOD SET(Good opts + lvl 8 set)[Advice: Go Armory for mace HKs and you'll see the difference..lvl6 armory gives 120 extra defence only taking out little of the dmg]
Swordies on the other hand will TANK much better and also deal VERY GOOD DAMAGE..
Coming to G10, imo, SWORD FTW! Theres no force in A3 that can touch a full G10 Sword HK. Trust me.
Anyways, HK= Immortal.