It's usually better to focus on one thing...
for example, maximize attack (especially when there's also mass haste).
And a lot depends on the artifacts – if you see attack artifacts lying around, boost your monster's attack; if there are magic artifacts everywhere, try boosting your mage. Therefore, polls about what's better – eggs or chicken – attack/defense or warrior/mage – are irrelevant. It all depends on the specific situation.
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