I can both scream and growl (if you want proof, head over to myspace.com/beyondpurity, my band myspace), and the screaming/growling debate:
Well, first off, screaming is way harder to learn, way harder to learn to execute, and you need to be in perfect shape to be able to produce great ones.
Growling is easier to learn, and easier to execute, but it takes a shitload more air & energy to use.
I prefer screaming, it is a way more versatile technique, you can mix it easily with cleans, and overall, it is a more perfect technique, 'cause it requires less air & energy, and you can use that energy to sing longer, more intense verses, or jump around like a madman during live performances. The reason anders abandoned growls, is that he prefers the scream, nothing else.
