The best replacement for tamron 70-300 is nikon 70-300.

The best alternatives to tamron 70-300 are rated as following:
★★★★★  nikon 70-300
★★★★★  sigma 70-300
★★★★★  nikon 55-300
★★★★  canon 70-300
★★★  canon 55-250
★★★  nikon 55-200
★★  sony 70-300g
★★  tamron 70-200
★★  canon 75-300
★★  pentax 55-300
★  18-270
★  sony 75-300
  sigma

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Speaking about tamron 70-300, one probably shouldn't forget about teleconverter.

Other search terms related to tamron 70-300 and their ratings are:
★★★★★ teleconverter
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tamron 70-300
nikon 70-300
sigma 70-300