Megadeth all the way. Mustaine is a much better songwriter than Hetfield and Ulrich combined and album for album, Megadeth are far superior, for example just compare "Death Magnetic" to "Endgame" and you will hear a difference in songwriting as well as musicianship. Megadeth have had at least three lead guitarists who were far superior to Hammett( Friedman, Broderick and Poland) at one time or another and while Metallica are spewing dumbed down bullsh*it since Burton died like Clint Eastwood said, Megadeth are always evolving. Hey they may not be mainstream but what Megadeth fan wants them to be? (Plus Mustaine actually has a ****ing personality unlike the ****tards in Metallica).