The best replacement for 10.9 is 10.8.

The best alternatives to 10.9 are rated as following:
★★★★★  10.8
★★★★  10.6
★★★★  10.8.5
★★★★  12.9
★★★★  10.7
★★  b7
★★  grade 8.8
★  grade 8
★  grade 5
★  10.6.8
★  8.8
  8.8 grade

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10.9
10.8
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