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Teeth vs no teeth is a personal preference thing. Teeth are intended to keep livestock out but honestly after many years running tanks both ways I can say there is no significant difference. With no teeth, the water layer flowing over the weir tends to be so thin that it naturally prevents livestock from going over the edge anyways.
These days I go without teeth. For one thing, it's a lot easier to build a box without them. Secondly, I find toothless overflows to be much quieter. A smooth, uninterrupted layer of water flowing over a smooth weir can be literally silent, while a box with teeth almost always has at least some splashing noise from the teeth causing turbulence.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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