The blunts do miss undead just as much as swords do. It`s hard to tell though if a blunt has a +undead damage bonus though since most 1 hand blunts are more damage then swords. I carry a pris forged carb flamberge for the 1.6 delay it has and its swings super fast. I also carry a carb morning star with a 2.3 delay and while it does swing a but slower then the flamberge it hits for a dencent amount more. I am wagering though that on a dps parser thay are about the same though since the sword swings faster and youll get more swings and hits per minute with the sword compared to the fewer harder hits you would get with the blunt.
good rule of thumb though to follow is pick whatever weapon type you like the most.slash/blunt and find the fastest one you can find for 1 handed use. starfall is a great mace even though it looks like a toilet brush but i sem to kill alot faster with the weakend ghoulbane and that right bow is around 20 points less damage then the starfall. The starfall is also a really slow weapon with a 2.5 delay. the greatmaces and greatswords have 2.5 delay too. Try to keep your one hander in the 2 second or under delay range and leave the higher delay for the 2 handers. You will see a difference soloing if you keep that in mind. It`s worked for me for 34 lvls.