Evasive is "better" in terms of reducing incoming damage when the mob has a relatively high damage bonus in comparison to their damage interval. I had posted a list of the preferred disc sometime in the past 10 years.
From a practical standpoint though, defensive is almost always better for raid mobs* since reducing spike damage is far superior to reducing overall damage taken over a longer period. I think the only raid mob where we used evasive over defensive was in Txevu.
*For exp mobs, uptime matters most.
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