Dual class if you want to fine tune your character like developing a fighter then dual to a mage or thief(or remain to be human), that way you will have relatively high hitpoints to start off with your second class. But it is also riskier since the 1st class' benefits will not be "returned" to you until your 2nd class' level exceed the level of your 1st class.
Multi class does have the racial advantages, for example like elfs have resistance to certain spells (e.g. sleep).
Personally, I prefer dual class.
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