The best replacement for 11b is 11c.

The best alternatives to 11b are rated as following:
★★★★★  11c
★★★★★  11x
★★★★★  19d
★★★★  0311
★★★★  11g
★★★  13f
★★★  12b
★★  68w
★★  31b
★★  19k
★  11g wireless mode
★  11d
★  13b
★  11c army
★  18x
★  21b
★  88m
★  19d army
  91b
  11g wireless

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11b
11c
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