Hmm... I'd have to go with Pastor Zeke. I've only ever seen his sermons via the pay-per-view livestreams on the LBC intranet server, but even through a computer screen he's mesmerizing. Your hairs stand up and your blood rushes as he evangelizes and testifies, cursing out the devil and glorifying God. To see him in person must be electrifying, like watching Jesus Christ himself preaching 2,000 years ago with your own eyes. I've looked far and wide for another comparable orator and nobody else even comes close to Ezekiel Flint (grace be upon him).
This guy is a distant second: