SM58. The SM57 has such a tight pattern that any off axis movement by the talent results in a more noticable volume drop off. The SM58 has a bit more proximity effect in my experience, if the singer is going to eat the mike the entire time then perhaps the SM57 could work better. I would still start with the SM58, it is usually used for it's ability to withstand close proximity screaming (I mean withstand physically, not sonically!). I believe it is used often by NIN and Marilyn Manson for this reason. It's "smaller" sound can be easily eq'ed to peirce through the wall of distortion and cacophony typical of this style.
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Chris R. Gibson
aka Loopy C
Micworks Ken Tamplin Mastering
