We had a pretty in-depth conversation about this in #diablo last night.
In general: If your build uses ANY proc abilities (e.g. generators, on-hit effects, on-crit effects, so on) You will benefit from faster attack speed.
If you build uses NO proc abilities, then you will benefit from slower attack speed.
That is under the assumption you will stand still.
But since.. no one will be standing still. You will need to be moving between abilities, and having a faster attack speed will allow you to fire off those spells quicker.
In practice: Faster attack speed is (almost)ALWAYS better than slower attack speed.
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In general: If your build uses ANY proc abilities (e.g. generators, on-hit effects, on-crit effects, so on) You will benefit from faster attack speed.
If you build uses NO proc abilities, then you will benefit from slower attack speed.
That is under the assumption you will stand still.
But since.. no one will be standing still. You will need to be moving between abilities, and having a faster attack speed will allow you to fire off those spells quicker.
In practice: Faster attack speed is (almost)ALWAYS better than slower attack speed.