These two songs almost encapsulate the continuing battle between Megadeth, Metallica, and their fans. On the one hand you've got the origional "The Four Horsemen" on Metallica's debut "Kill 'Em All" album which was a speedy, furious epic about Hell's messengers. Now, you have to remember that Dave Mustaine was still in Metallica when The Four Horsement was written and had a part in writing it, so one can understand him being pissed off about being kicked out of the band right when it was on it's way up and wanting to write a "F**K YOU!" comeback song to get back at his former band. And sure enough, with Megadeth's first release, "Killing Is My Business... And Business Is Good" came that song simply called "Mechanix" which had the exact same riffs as The Four Horsemen except for the altered intro.

Now, to me, both songs speak greatly of the fued between these two thrash bands, however, The Four Horsemen seems to be more controlled and clean, while Mechanix sounds a bit more sloppy, and rushed (due to its quicker tempo). The reason for this sound was probably Mustaine's being so anxious for his new bands debut to get out as quick as possible so it could compete with Kill 'Em All and possibly Metallica's next record. Regardless of it's rushed sound, you can definitely hear the anger in Mustaine's voice and even in his guitar playing, which makes it an all out angry, aggressive song.

Finally, my choice (since I'm being forced to chose) would have to be The Four Horsemen because of it's overall cleaner sound despite the emotion which is present in Mechanix.