Don't know; they're different. If I had to choose I'd probably go see Merzbow if I was sure he'd be analogue. If he's on laptop... dunno. Maybe still Merzbow if I'd never seen him before, just because I've listened much more often to him than to NSB. I don't have to choose though because NSB are playing Holland again but Merzbow isn't.
maybe this helps you to decide where to go to
Nihilist Spasm Band radio session from 2006
http://www.vpro.nl/programma/dwars/a...edia/31204527/
interview (skip forward 10 minutes)
http://www.vpro.nl/programma/dwars/a...edia/32295413/