depending on the reach you need a nikon 55-200 is another option its a known quantity though more expensive again (but around this price 2nd hand) and shorter range
Me neither. I've had the Tamron on my wish list for a while, and saw it as the best option for my D3400 as it has AF. If this has it as well, it'd be worth considering.
i am just going by what i read, haven't used either
The only benefit I saw of the Tamron over the Sigma (other than user reviews) is that the Tamron has an AF motor built in, and the Sigma doesn't. But I think now the Sigma actually does have an AF motor built in?
I have the APO version of this lens, costs just a little bit more. But for the money it is a pretty decent lens.