The best replacement for a321 is 757.

The best alternatives to a321 are rated as following:
★★★★★  757
★★★★  a320
★★★★  737
★★★  a319
★★  boeing 757
★★  767
★★  737-800
★★  a330
★★  b737-900er
★★  737-400
★  boeing 737
★  739
★  b737
★  b757
★  a321t
★  757-200
  737 900
  boeing 767

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Google Trends

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a321
757
a320