Evasive mitigates 25% of the damage you would take, on average, but with variance. Defensive mitigates 35% of the damage you take, with no variance. The rule of thumb is that Defensive is better unless:
1) If there is a proc on successful hits that is nasty enough that the procs are doing more than 15% of the total damage you're taking.
2) You are in a situation where the 3 minute lower cooldown is relevant. This is generally in XPing groups, where evasive mitigates more damage over time because when used on cooldown it is active for a larger % of the total time fighting, but could also be for any sort of very extended combat situation with few or no breaks.
Which is pretty much in line with the OP's suggestion.
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