The best replacement for 12-27 is 12-28 cassette.

The best alternatives to 12-27 are rated as following:
★★★★★  12-28 cassette
★★★★★  11-28 cassette
★★★★  12-25
★★★  11-25 cassette
★★★  11-28
★★★  11-25
★★  11-26
★★  12-25 cassette
  12-28

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12-27
12-28 cassette
11-28 cassette