Your top 5 favorite vocalists.

1. Mikey.
2. James Hetfield (in the recent albums he sing just great, even if the music is crap)
3. The bloke from My Dying Bride
4. Brucey D.
5. I can't quite decide on the last one.
 
1) Morrissey (no coments...he's the the best in my opinion)
2) Mikael (clean voice...the death ones are good too)
3) Jan Chris de Koeijer (my favorite death vocalist)
4) Dani Filth (especially from Dusk era)
5) Frejat (the singer of Barão Vermelho, a brazilian band)
 
Death Vox:
1)Windom Pearl
2)Mikael Akerfeldt
3)Isahn
4)Abbath
5)Tomas Lindberg

Clean:
1)Simen Hestnaes
2)Isahn
3)Garm
4)Mikael Akerfeldt
5)Vintersorg/Grutle Kjellson (tough to choose!)
 
clean:
1. Jonas Renkse
2. Mikael Åkerfeldt
3. Cristina Scabbia
4. Layne Staley
5. Aaron (mdb)

growl:

1. Mikael Åkerfeldt
2. Isahn
3. Aaron
4. Tomas Lindberg
5. Angela Gossow
 
Tooooooo many. I'll just mention the ones I can think of now, but
I'm sure I'll fuck up.

1. Chuck Schuldiner, master of metal
2. Mike Patton, insanity unleashed
3. Dan & Mikael (yeah!)
4. Ray Alder, very good vocalist!
5. King Diamond, master of implicit horror
 
You're quite low on arguments... Well, My choices:
Mikael Åkerfeldt: He has found his way of singing early and has also developed it all the way.
L.G. Petrov / Matti Kärki: Pioneers of Swedish Death Metal. They both have a superior grunting, maybe Kärki has a little bit better voice... I can't decide...
Bruce Dickinson: A GOD. From "Number of the Beast" to "Brave New World" very strong world, not to mention his solo works...
Robert Smith: Singer of The Cure if you don't know. He has god-like melancholy in his voice in his voice, which pales the face of ANY gothic singer. Period.
Andrw Eldritch: Another creator of melancholic voices. Maybe a forehather of ALL things laconic. Anothr Period.

Sorry about the typos, I'm drunk....