It seems to me that Nanovue is a standalone spec, while NanoDrop needs a computer to produce the O.D. reading. I do not use a Nanovue, but I am happy with the NanoDrop. Basically, both have more or less the same functions. You can compare with the price before you make your decision.
Retired academic researcher. Mention of a specific product does not imply my endorsement of the product. No conflict of interest or guarantee to work on the advice given. Do as I say, not as I do. Not liable to the loss of your valuable samples.