Boasting a twin-turbo 5.5-liter V8 and twin-turbo 6.0-liter V12, theres really no question that either car is an impressive performer
http://www.emercedesbenz.com/autos/mercedes-benz/sl-class/which-would-you-rather-%e2%80%93-the-sl63-amg-or-the-sl65-amg/