If your plot has had good drainage, I'd wait until the foliage begins to die before harvesting. Remember that as the plants begin to "fade", they send all their energy and nutrients to the spuds. If you can afford to wait, you patience will be rewarded.
Oh, and don't forget to let them dry out before you store them. The skin needs to dry for optimal tater shelf-life!
As for sweet taters, I couldn't say since I've never grown them before.
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