This week's Clash of the Titans features a battle of Black Sabbath lineups, as 'God is Dead?' from the group's most recent album '13' faces off against 'The Bible Black,' a song from Heaven & Hell's 2009 'The Devil You Know.'

The latter group, as any metal fan worth their salt already knows, is the name assumed by the 'Mob Rules' / 'Dehumanizer' lineup of Black Sabbath -- which featured Ronnie James Dio, Tony Iommi, Geezer Butler and Vinny Appice -- upon their reunion in 2007. Five years ago this week, the group released their only full-length studio album, which featured the dynamic, twisting anthem 'The Bible Black.'

Four years later, Iommi and Butler were rejoined by singer Ozzy Osbourne, which meant they were allowed to use the Black Sabbath name for their reunion album. Much like Heaven & Hell's debut 'Devil' single, the nine-minute lead track from '13' was a religiously-themed epic that's earned a place on the group's already crowded concert set lists.

So which one is better? This Clash of the Titans will stay open until May 4, 2014 at 11:59PM ET. You can vote once an hour for your favorite, and you can listen to them below.

Watch Black Sabbath Perform 'God is Dead?'

Watch Heaven & Hell Perform 'The Bible Black'