Symphony D.
Deity
The original is the best. Although I'd say the third one is still better than the second.
The original is so extremely bland, repetitive, and on close inspection, synthrock rather than actual rock. Hellmarch's chief benefit is that it has a catchy beat. 3 is basically 2 in structure but Art Deco. This lifts what is otherwise something bland and uninspiring like, say the Flatiron Building, into something like the Chrysler Building or Empire State Building--worthy of competing with the Sears Tower of the original. It's multilayered, complex, rich, oppulent, sweeping, baroque, and vaguely creepy.Its good, but rather complex, the original still fits a MBT charge/overpowering force theme better.
While Hellmarch captures a bit of combat, and does so quite well (in say the intro sequence, as Dachs says), 3 implies much more a dystopian and bizarre world of wildly conflicting ideologies (with its odd mix of electronica, chorus, guitar, and sampling--it's a bit light on bass admittedly). You might like the first three minutes of Hellmarch while watching the intro or doing something martial, but you can listen to Hellmarch 3 anytime for almost anything sort of dark and power-based.
[EDIT] Hellmarch 3 says "The world's at war." Hellmarch says "Some tanks are shooting at each other."