The best replacement for 87 is 89 octane.

The best alternatives to 87 are rated as following:
★★★★★  89 octane
★★★★★  91 octane
★★★★  89 gas
★★★★  93 octane
★★  93
★★  89 octane gas
★★  91
★★  91 gas
★  1100
★  92 octane
★  89
★  91 octane gas
★  93 gas
★  89 gasoline
★  85 octane
  93 octane gas
  mossberg 930
  88
  91 octane fuel
  benelli m2
  189
  browning gold
  89 octane fuel
  beretta 391
  ps 9
  fluke 88

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Speaking about 87, one probably shouldn't forget about 93.

Other search terms related to 87 and their ratings are:
★★★★★ 93
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87
89 octane
91 octane