The best replacement for r19 is r30.

The best alternatives to r19 are rated as following:
★★★★★  r30
★★★★★  r30 insulation
★★★★  r21
★★★  r13 insulation
★★★  r13
★★  r21 insulation
★★  r49
★★  r38 insulation
★★  r38
★  r11
★  r11 insulation
★  r15
  zr19
  r30 attic insulation
  r20 insulation

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r19
r30
r30 insulation