@Baghdaddy:
On defense, the ARM/INF combination actually outperforms the same IPC ART/INF combination.
I disagree.
On defense, I set up the two following scenarios with 60IPC of defenders:
7inf 7arm attacking 12arm: A Survives 54.2%, D Survives 43.6%, Mutual Destruction 2.2%
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7inf 7arm attacking 15art: A Survives 51.2%, D Survives 47.6%, Mutual Destruction 1.3%
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The attacking force isn’t really important (as long as it is the same force in both scenarios), but this shows that in this scenario the artillery are clearly better for defending than armour. However, some scenarios (with a better skew of defensive forces) would perform better defensively with a build of armour. eg:
7inf 7arm attacking 6inf 8 arm: A Survives 28.2%, D Survives 70%, Mutual Destructon 1.6%
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7inf 7arm attacking 6inf 10art: A Survives 36.9%, D Survives 62.1%, Mutual Destructon 0.8%
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It depends on the scenario. Sometimes arm defends better than art, and sometimes art defends better than arm.