The best replacement for mig 21 is phantom.

The best alternatives to mig 21 are rated as following:
★★★★★  phantom
★★★★  f4
★★★★  f 16
★★★  f-4
★★  f5
★★  f 15
★★  mirage 3
★★  f-5
★★  phantom f4
★★  f 104
★★  tejas
★★  f-104
★  f8 crusader
★  f-15
★  f 5
★  j 7
  f7
  f 4 phantom
  f-8
  f-4 phantom
  lca tejas
  starfighter

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