I was gonna put a poll, but I took too long gathering all the death deities.
Here are the ones I found in various supplements.
Kelemvor (LN): Fate and death. (Faerun)
Jergal (LN): Recordkeeper of death. (Faerun)
Velsharoon (NE): Necromancy, undeath. (Faerun)
Anubis (LN): Judgement of the dead. (Egypt)
Nephtys (CG): Protector of the dead. (Egypt)
Osiris (LG): He’s dead, and he rules over the dead. (Egypt)
Nerull (NE): Death and murder with a scythe. (Greyhawk)
Wee Jas (LN): Death, magic, and vanity. (Greyhawk)
Hades (NE): Death, the underworld and wealth. (Greece)
Odin (NG): Brings fallen warriors to Valhalla. (Norse)
Hel (NE): Half-beautiful, half-ugly child of Loki and a giantess. (Norse)
Personally, I love Wee Jas. I like Odin a lot.
I am bored by anything involving "I'm an evil scary necromancer."