The best replacement for r13 is r19.

The best alternatives to r13 are rated as following:
★★★★★  r19
★★★★★  r15 insulation
★★★★★  r30
★★★★  r15
★★★★  r19 insulation
★★★  r11
★★  e11
★★  r30 insulation
★★  r14
★  r11 insulation
★  d13
★  tosca
  e13
  festival
  r13

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r13
r19
r15 insulation