The best replacement for tamron 18-270 is sigma 18-250.

The best alternatives to tamron 18-270 are rated as following:
★★★★★  sigma 18-250
★★★★★  nikon 18-200
★★★★★  nikon 18-300
★★★  tamron 28-300
★★★  canon 18-135
★★★  canon 18-200
★★  18-200
★★  nikon 18-140
★★  sony 18-250
★★  nikkor 18-200
★  28-300
★  tamron 18-250
★  nikon 55-300
★  canon 55-250
★  sigma 18-250 review
  sigma 18-200
  nikon 28-300
  nikon 18-105

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Speaking about tamron 18-270, one probably shouldn't forget about teleconverter.

Other search terms related to tamron 18-270 and their ratings are:
★★★★★ teleconverter
★★ sony a65
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tamron 18-270
sigma 18-250
nikon 18-200