The best replacement for sd-1 is od-3.

The best alternatives to sd-1 are rated as following:
★★★★★  od-3
★★★★  ds-1
★★★  bd-2
★★★  od-1
★★  ts9
★★  tube screamer
★★  bad monkey
★  boss ds-1
★  zw-44
  boss od-3

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sd-1
od-3
ds-1