Which one sounds better?

In terms of power and performance, there's no question the Demon is clearly the winner.
The Demon is Dodge’s finest: its 840 hp 6.2-liter HEMI, designed to run on 100+ high-octane fuel, is the brand's most powerful V8 to date. Subsequently, the Demon is the fastest quarter-mile car in the world, passing the quarter-mile (400-meter) mark 9.65 seconds after the launch. Actually, it's so powerful that Dodge can't release it in the world without a specific set of restrictions.
The Hellcat — which recently received a wide-body upgrade — is the Challenger’s slightly milder version, although this pumped muscle car means no joke either: it packs 707 hp and 650 lb-ft of torque, enough for a 3.6-second 0-to-60 mph sprint.
This video, however, doesn’t try to set one against each other in a drag race but to find out which one sounds better. So turn up your speakers and listen to some serious V8 growl (and the implicit intake whining sound).