People generally use the best ratio they can afford for offhand, regardless of 1hb/1hs/piercing. Some people use slower weapons when possible, but I don't really see any good reason to do that. I think people claim that a slower weapon is less aggro, but that would only be true in mainhand where damage bonus factors into the aggro equation so that faster weapons generate more aggro than slower weapons of the same ratio; you hit damage shields slightly fewer times and have slightly less push... not a big deal really.
Sometimes it is helpful to have a slow proc or a snare proc or a stun proc in your offhand, but this doesn't come up very often and it usually doesn't make a very big difference anyways.
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