Dual wield logic

[Lyta]

I'm trying to understand how dual wield works, if i have two weapons and one has a higher attack delay than the other, which should go in main hand?

Like if i put the one with longest delay in main hand, then the other has time to go off cooldown and should always be ready when main hand attacks, conversely if the one with the shortest delay is in main hand it's delay isn't wasted waiting for the slower one.