The best replacement for butterworth is chebyshev.

The best alternatives to butterworth are rated as following:
★★★★★  chebyshev
★★★★  linkwitz riley
★★★★  bessel
★★  aunt jemima
★★  chebyshev filter
★  linkwitz
★  linkwitz-riley
★  solen split
  log cabin
  seminole
  chebychev
  chebyshev filters
  seminole tribe

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butterworth
chebyshev
linkwitz riley