The best replacement for miter saw is table saw.

The best alternatives to miter saw are rated as following:
★★★★★  table saw
★★★★  circular saw
★★★★  compound miter saw
★★★  chop saw
★★★  radial arm saw
★★  sliding miter saw
★★  miter saw
★  miter box
★  non sliding
  bandsaw
  craftsman miter saw
  compound
  cut off saw
  band saw
  10 sliding miter saw
  single bevel miter saw
  12 miter saw
  dewalt miter saw
  coping saw
  mitre saw
  dewalt
  hitachi

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Speaking about miter saw, one probably shouldn't forget about free stand.

Other search terms related to miter saw and their ratings are:
★★★★★ free stand
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Google Trends

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miter saw
table saw
circular saw