As for myself, under normal conditions I'd prefer assassination cuz if successful that stops the AI from deploying an agent on another mission for at least 2 turns (since they can't be deployed when recruited), and when they do of course it'll be minus any abilities their previous agent managed to acquire. However, persuading them to your cause is really useful, especially in the early game, since you only have a single spy to work with. I've never been able to pull that off though even when the chances are high
There's also the consideration that if an agent is susceptible to persuasion once, they might be vulnerable to it again when working for you. Can a rat ever be trusted?
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